diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..57872d0
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/vendor/
diff --git a/AhoCorasick.php b/AhoCorasick.php
new file mode 100644
index 0000000..c9441f2
--- /dev/null
+++ b/AhoCorasick.php
@@ -0,0 +1,151 @@
+<?php
+
+/*
+ * ahocorasick - fast string searching in php
+ *
+ * Copyright (c) 2017-2018 Lewis Van Winkle
+ *
+ * http://CodePlea.com
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software. If you use this software
+ *    in a product, an acknowledgement in the product documentation would be
+ *    appreciated but is not required.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ */
+
+
+
+class AhoCorasick
+{
+
+    private $nodes = [ [] ];
+
+    private $final = 0;
+
+    /**
+     * Add a keyword to search for.
+     *
+     * @param string $needle
+     * @throws Exception
+     */
+    public function addNeedle(string $needle)
+    {
+        if ($this->final) {
+            throw new Exception('Cannot add word to finalized ahocorasick.');
+        }
+
+        $nodes = &$this->nodes;
+        $n = 0;
+
+        $needleLength = strlen($needle);
+
+        for ($i = 0; $i < $needleLength; ++$i) {
+            $c = $needle[$i];
+
+            if (!isset($nodes[$n][$c])) {
+                $nodes[$n][$c] = count($nodes);
+                $nodes[] = [];
+            }
+            $n = $nodes[$n][$c];
+        }
+
+        $nodes[$n][0][] = $needle;
+    }
+
+    /**
+     * Create the structure needed to search text for the given keywords.
+     * Once you call this, you cannot add additional keywords via addNeedle().
+     */
+    public function finalize()
+    {
+        $nodes = &$this->nodes;
+        $queue = [];
+
+        foreach ($nodes[0] as $j => $_) {
+            $nodes[$nodes[0][$j]][1] = 0;
+            $queue[] = $nodes[0][$j];
+        }
+
+        while (count($queue)) {
+            $r = $queue[0];
+            $queue = array_slice($queue, 1);
+
+            foreach ($nodes[$r] as $j => $_) {
+                if ($j === 0 || $j === 1) {
+                    continue;
+                }
+                $v = $nodes[$r][1];
+                $u = $nodes[$r][$j];
+                while ($v > 0 && !isset($nodes[$v][$j])) {
+                    $v = $nodes[$v][1];
+                }
+                $nodes[$u][1] = $nodes[$v][$j] ?? $v;
+                if (isset($nodes[$nodes[$u][1]][0])) {
+                    if (!isset($nodes[$u][0])) {
+                        $nodes[$u][0] = [];
+                    }
+                    $nodes[$u][0] = array_merge($nodes[$u][0], $nodes[$nodes[$u][1]][0]);
+                }
+                $queue[] = $u;
+            }
+        }
+
+        $this->final = 1;
+    }
+
+    /**
+     * Search the text for the given keywords.
+     *
+     * @param string $haystack
+     * @return array
+     * @throws Exception
+     */
+    public function search(string $haystack):array
+    {
+        if (!$this->final) {
+            throw new Exception('Must call finalize() before search.');
+        }
+
+        $nodes = &$this->nodes;
+        $found = [];
+        $n = 0;
+
+        $haystackLength = strlen($haystack);
+
+        for ($i = 0; $i < $haystackLength; ++$i) {
+            $c = $haystack[$i];
+
+            while (!array_key_exists($c, $nodes[$n]) && $n) {
+                $n = $nodes[$n][1];
+                if ($n === null) {
+                    die();
+                }
+            }
+
+            if (isset($nodes[$n][$c])) {
+                $n = $nodes[$n][$c];
+            }
+
+            if (isset($nodes[$n][0])) {
+                $z = $nodes[$n][0];
+                foreach ($z as $w) {
+                    $found[] = [$w, $i - strlen($w) + 1];
+                }
+            }
+        }
+
+        return $found;
+    }
+}
diff --git a/README.md b/README.md
index 86897cd..82aae2c 100644
--- a/README.md
+++ b/README.md
@@ -24,13 +24,13 @@ search text.
 Create, add keywords, and `finalize()`:
 
 ```php
-require('ahocorasick.php');
+require('AhoCorasick.php');
 
-$ac = new ahocorasick();
+$ac = new AhoCorasick();
 
-$ac->add_needle('art');
-$ac->add_needle('cart');
-$ac->add_needle('ted');
+$ac->addNeedle('art');
+$ac->addNeedle('cart');
+$ac->addNeedle('ted');
 
 $ac->finalize();
 
@@ -97,10 +97,17 @@ time: 0.054709911346436
 
 ```
 
-Note: the regex solutions are actually slightly broken. They won't work if you
+**Note:** the regex solutions are actually slightly broken. They won't work if you
 have a keyword that is a prefix or suffix of another. But hey, who really uses
 regex when it's not slightly broken?
 
-Also keep in mind that building the search tree (the `add_needle()` and
+Also keep in mind that building the search tree (the `addNeedle()` and
 `finalize()` calls) takes time. So you'll get the best speed-up if you're
 reusing the same keywords and calling `search()` many times.
+
+# Running tests
+
+```$php
+$ composer install
+$ ./vendor/bin/phpunit
+```
\ No newline at end of file
diff --git a/benchmark.php b/benchmark.php
index ef08f6f..7f82250 100644
--- a/benchmark.php
+++ b/benchmark.php
@@ -4,36 +4,32 @@
 /* It compares our ahocorasick method with regex and strpos. */
 
 
-require('ahocorasick.php');
-require('benchmark_setup.php'); /* keywords and text */
+require 'AhoCorasick.php';
+require 'benchmark_setup.php'; /* keywords and text */
 
 $loops = 10;
 
-print("Loaded " . count($needles) . " keywords to search on a text of " .
-  strlen($haystack) . " characters.\n");
+print('Loaded ' . count($needles) . ' keywords to search on a text of ' .
+    strlen($haystack) . " characters.\n");
 
 print("\nSearching with strpos...\n");
 
 $st = microtime(1);
 for ($loop = 0; $loop < $loops; ++$loop) {
-  $found = array();
-  foreach($needles as $n) {
-    $k = 0;
-    while(($k = strpos($haystack, $n, $k)) !== FALSE) {
-      $found[] = array($n, $k);
-      ++$k;
+    $found = array();
+    foreach ($needles as $n) {
+        $k = 0;
+        while (($k = strpos($haystack, $n, $k)) !== false) {
+            $found[] = array($n, $k);
+            ++$k;
+        }
     }
-  }
 }
 $et = microtime(1);
-print("time: " . ($et - $st) . "\n");
+print('time: ' . ($et - $st) . "\n");
 $found_strpos = $found;
 
 
-
-
-
-
 print("\nSearching with preg_match...\n");
 //Note, this actually sucks and misses cases where one needle is a prefix or
 //suffix of another.
@@ -41,20 +37,15 @@
 
 $st = microtime(1);
 for ($loop = 0; $loop < $loops; ++$loop) {
-  $found = array();
-  $k = 0;
-  while(preg_match($regex, $haystack, $m, PREG_OFFSET_CAPTURE, $k)) {
-    $found[] = $m[0];
-    $k = $m[0][1] + 1;
-  }
+    $found = array();
+    $k = 0;
+    while (preg_match($regex, $haystack, $m, PREG_OFFSET_CAPTURE, $k)) {
+        $found[] = $m[0];
+        $k = $m[0][1] + 1;
+    }
 }
 $et = microtime(1);
-print("time: " . ($et - $st) . "\n");
-//print_r($found);
-
-
-
-
+print('time: ' . ($et - $st) . "\n");
 
 
 print("\nSearching with preg_match_all...\n");
@@ -64,57 +55,51 @@
 
 $st = microtime(1);
 for ($loop = 0; $loop < $loops; ++$loop) {
-  $found = array();
-  $k = 0;
-  preg_match_all($regex, $haystack, $found, PREG_OFFSET_CAPTURE);
-  $found = $found[0];
+    $found = array();
+    $k = 0;
+    preg_match_all($regex, $haystack, $found, PREG_OFFSET_CAPTURE);
+    $found = $found[0];
 }
 $et = microtime(1);
-print("time: " . ($et - $st) . "\n");
-
-
-
+print('time: ' . ($et - $st) . "\n");
 
 
 print("\nSearching with aho corasick...\n");
-$ac = new ahocorasick();
-foreach ($needles as $n) $ac->add_needle($n);
+$ac = new AhoCorasick();
+foreach ($needles as $n) {
+    $ac->addNeedle($n);
+}
 $ac->finalize();
 
 $st = microtime(1);
 for ($loop = 0; $loop < $loops; ++$loop) {
-  $found = array();
-  $found = $ac->search($haystack);
+    $found = $ac->search($haystack);
 }
 $et = microtime(1);
-print("time: " . ($et - $st) . "\n");
-
-
-
-
+print('time: ' . ($et - $st) . "\n");
 
 
 //Check that the answers match.
 //First sort the arrays.
-$comp = function($a, $b) {return ($a[1] === $b[1]) ? ($a[0] > $b[0]) : ($a[1] > $b[1]);};
+$comp = function ($a, $b) {
+    return ($a[1] === $b[1]) ? ($a[0] > $b[0]) : ($a[1] > $b[1]);
+};
 usort($found, $comp);
 usort($found_strpos, $comp);
 
 if ($found_strpos !== $found) {
-  print("ERROR - Aho Corasick got the wrong result.\n");
+    print("ERROR - Aho Corasick got the wrong result.\n");
+
+    print('strpos size: ' . count($found_strpos) . "\n");
+    print('aho corasick size: ' . count($found) . "\n");
 
-  print("strpos size: " . count($found_strpos) . "\n");
-  print("aho corasick size: " . count($found) . "\n");
+    $numberFound = count($found);
 
-  for ($i = 0; $i < count($found); ++$i) {
-    if ($found_strpos[$i] !== $found[$i]) {
-      print("Mismatch $i\n");
-      print_r($found_strpos[$i]);
-      print_r($found[$i]);
+    for ($i = 0; $i < $numberFound; ++$i) {
+        if ($found_strpos[$i] !== $found[$i]) {
+            print("Mismatch $i\n");
+            print_r($found_strpos[$i]);
+            print_r($found[$i]);
+        }
     }
-  }
 }
-
-
-
-
diff --git a/benchmark_setup.php b/benchmark_setup.php
index 83aa0ba..2cddf5a 100644
--- a/benchmark_setup.php
+++ b/benchmark_setup.php
@@ -1,6 +1,6 @@
 <?php
 
-$needles = array('abandonment', 'abashed', 'abashments', 'abduction',
+$needles = ['abandonment', 'abashed', 'abashments', 'abduction',
 'aberrant', 'abiding', 'abidingly', 'abjures', 'ablution', 'abolishes',
 'abominably', 'aborted', 'abrasion', 'abridgment', 'abscesses', 'absconds',
 'absences', 'absinthe', 'absolves', 'absorbingly', 'abundant', 'abused',
@@ -532,7 +532,7 @@
 'remonstrates', 'remorse', 'removes', 'remunerated', 'rendering',
 'renditions', 'reneged', 'renominate', 'renovators', 'reorders',
 'repatriates', 'repave', 'repaying', 'repeatedly', 'repertoires', 'replied',
-'reprehend', 'reprieves', 'reprimanded');
+'reprehend', 'reprieves', 'reprimanded'];
 
 $haystack = 'unscathed grampus antinuclear avenged waste oversee doggies spumes
 senators balk gooseberries grilles respelled ceramists outlaid maladroitly
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..bf76ee6
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,15 @@
+{
+    "name": "codeplea/ahocorasickphp",
+    "description": "Aho-Corasick multi-keyword string searching library in PHP.",
+    "type": "library",
+    "config": {
+        "sort-packages": true
+    },
+    "require": {
+        "php": ">=7.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^7.3"
+    },
+    "license": "zlib"
+}
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..d4dfe43
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1426 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "966160d8324d61ff56d89c2c5df36bbe",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "reference": "185b8868aa9bf7159f5f953ed5afb2d7fcdc3bda",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "require-dev": {
+                "athletic/athletic": "~0.1.8",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpunit/phpunit": "^6.2.3",
+                "squizlabs/php_codesniffer": "^3.0.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "http://ocramius.github.com/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://github.com/doctrine/instantiator",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "time": "2017-07-22T11:58:36+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.8.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
+                "reference": "3e01bdad3e18354c3dce54466b7fbe33a9f9f7f8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1"
+            },
+            "replace": {
+                "myclabs/deep-copy": "self.version"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.0",
+                "doctrine/common": "^2.6",
+                "phpunit/phpunit": "^7.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                },
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "time": "2018-06-11T23:09:50+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "1.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "phar-io/version": "^2.0",
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "time": "2018-07-08T19:23:20+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.6 || ^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "time": "2018-07-08T19:19:57+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-common",
+            "version": "1.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.5"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "phpDocumentor\\Reflection\\": [
+                        "src"
+                    ]
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jaap van Otterdijk",
+                    "email": "opensource@ijaap.nl"
+                }
+            ],
+            "description": "Common reflection classes used by phpdocumentor to reflect the code structure",
+            "homepage": "http://www.phpdoc.org",
+            "keywords": [
+                "FQSEN",
+                "phpDocumentor",
+                "phpdoc",
+                "reflection",
+                "static analysis"
+            ],
+            "time": "2017-09-11T18:02:19+00:00"
+        },
+        {
+            "name": "phpdocumentor/reflection-docblock",
+            "version": "4.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/94fd0001232e47129dd3504189fa1c7225010d08",
+                "reference": "94fd0001232e47129dd3504189fa1c7225010d08",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "phpdocumentor/reflection-common": "^1.0.0",
+                "phpdocumentor/type-resolver": "^0.4.0",
+                "webmozart/assert": "^1.0"
+            },
+            "require-dev": {
+                "doctrine/instantiator": "~1.0.5",
+                "mockery/mockery": "^1.0",
+                "phpunit/phpunit": "^6.4"
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+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides functionality to handle HHVM/PHP environments",
+            "homepage": "http://www.github.com/sebastianbergmann/environment",
+            "keywords": [
+                "Xdebug",
+                "environment",
+                "hhvm"
+            ],
+            "time": "2017-07-01T08:51:00+00:00"
+        },
+        {
+            "name": "sebastian/exporter",
+            "version": "3.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/exporter.git",
+                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/234199f4528de6d12aaa58b612e98f7d36adb937",
+                "reference": "234199f4528de6d12aaa58b612e98f7d36adb937",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "ext-mbstring": "*",
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.1.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Volker Dusch",
+                    "email": "github@wallbash.com"
+                },
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@2bepublished.at"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides the functionality to export PHP variables for visualization",
+            "homepage": "http://www.github.com/sebastianbergmann/exporter",
+            "keywords": [
+                "export",
+                "exporter"
+            ],
+            "time": "2017-04-03T13:19:02+00:00"
+        },
+        {
+            "name": "sebastian/global-state",
+            "version": "2.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/global-state.git",
+                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/global-state/zipball/e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "reference": "e8ba02eed7bbbb9e59e43dedd3dddeff4a56b0c4",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "suggest": {
+                "ext-uopz": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "time": "2017-04-27T15:39:26+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "7cfd9e65d11ffb5af41198476395774d4c8a84c5"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-enumerator/zipball/7cfd9e65d11ffb5af41198476395774d4c8a84c5",
+                "reference": "7cfd9e65d11ffb5af41198476395774d4c8a84c5",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "time": "2017-08-03T12:35:26+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/object-reflector/zipball/773f97c67f28de00d397be301821b06708fca0be",
+                "reference": "773f97c67f28de00d397be301821b06708fca0be",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "time": "2017-03-29T09:07:27+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "reference": "5b0cd723502bac3b006cbf3dbf7a1e3fcefe4fa8",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "time": "2017-03-03T06:23:57+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "1.0.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/resource-operations/zipball/ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "reference": "ce990bb21759f94aeafd30209e8cfcdfa8bc3f52",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "time": "2015-07-28T20:34:47+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "reference": "cb2f008f3f05af2893a87208fe6a6c4985483f8b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "time": "2017-04-07T12:08:54+00:00"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/0df1908962e7a3071564e857d86874dad1ef204a",
+                "reference": "0df1908962e7a3071564e857d86874dad1ef204a",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.3 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.6",
+                "sebastian/version": "^1.0.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.3-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "time": "2018-01-29T19:49:41+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/example.php b/example.php
index 744486e..596f40b 100644
--- a/example.php
+++ b/example.php
@@ -2,26 +2,26 @@
 
 /* Just an example of how to use the library. */
 
-require('ahocorasick.php');
+require 'AhoCorasick.php';
 
 
 
 /* Say we have the following text:
  * "a carted mart lot one blue ted"
- * and we want to find each occurance in
+ * and we want to find each occurrence in
  * it of the following list of keywords:
  * 'art', 'cart', 'ted'
  */
 
 
 /* Create the search engine. */
-$ac = new ahocorasick();
+$ac = new AhoCorasick();
 
 
 /* Add each keyword we'll search for. */
-$ac->add_needle('art');
-$ac->add_needle('cart');
-$ac->add_needle('ted');
+$ac->addNeedle('art');
+$ac->addNeedle('cart');
+$ac->addNeedle('ted');
 
 
 /* Now call finalize. This lets the engine
@@ -40,5 +40,3 @@
 /* It'll return an array with each keyword found and its
  * position in the search text. */
 print_r($found);
-
-
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..8797b37
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,7 @@
+<phpunit>
+    <testsuites>
+        <testsuite name="Aho Corasick PHP">
+            <directory>test</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>
\ No newline at end of file
diff --git a/test/AhoCorasickTest.php b/test/AhoCorasickTest.php
new file mode 100644
index 0000000..0d6a812
--- /dev/null
+++ b/test/AhoCorasickTest.php
@@ -0,0 +1,64 @@
+<?php
+use PHPUnit\Framework\TestCase;
+
+require 'AhoCorasick.php';
+
+class AhoCorasickTest extends TestCase
+{
+    protected $ahoCorasick;
+
+    public function setUp()
+    {
+        $this->ahoCorasick = new AhoCorasick();
+
+        parent::setUp();
+    }
+
+    public function testSearch()
+    {
+        $expectedResult = [
+            ['cart', 2],
+            ['art', 3],
+            ['ted', 5],
+            ['art', 10],
+            ['ted', 27],
+        ];
+
+        $this->ahoCorasick->addNeedle('art');
+        $this->ahoCorasick->addNeedle('cart');
+        $this->ahoCorasick->addNeedle('ted');
+        $this->ahoCorasick->finalize();
+
+        $found = $this->ahoCorasick->search('a carted mart lot one blue ted');
+
+        $this->assertSame($expectedResult, $found);
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Must call finalize() before search.
+     */
+    public function testCannotSearchUnlessFinalized()
+    {
+        $this->ahoCorasick->addNeedle('art');
+        $this->ahoCorasick->addNeedle('cart');
+        $this->ahoCorasick->addNeedle('ted');
+
+        $this->ahoCorasick->search('a carted mart lot one blue ted');
+    }
+
+    /**
+     * @expectedException Exception
+     * @expectedExceptionMessage Cannot add word to finalized ahocorasick.
+     */
+    public function testCannotAddNeedleAfterFinalize()
+    {
+        $this->ahoCorasick->addNeedle('art');
+        $this->ahoCorasick->addNeedle('cart');
+        $this->ahoCorasick->addNeedle('ted');
+
+        $this->ahoCorasick->finalize();
+
+        $this->ahoCorasick->addNeedle('mart');
+    }
+}