diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b9991e5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+.idea/
+
+/vendor/
diff --git a/README.md b/README.md
index 28029b9..7bc4128 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,56 @@
 # classnames-php
-PHP port of classnames
+PHP port of the JavaScript classNames utility. https://github.com/JedWatson/classnames
+
+## Installation
+
+```
+composer require cjstroud/classnames-php
+```
+
+The classNames can be accessed anywhere.
+
+```
+classNames('foo', ['bar' => true]); // 'foo bar'
+```
+
+## Usage
+
+The `classNames` function takes any number of arguments which can be a string or array. 
+When using an array, if the value associated with a given key is falsy, that key won't be included in the output. 
+If no value is given the true is assumed.
+
+```
+classNames('foo'); // 'foo'
+classNames(['foo' => true]); // 'foo'
+classNames('foo', ['bar' => false, 'baz' => true]); // 'foo baz'
+classNames(['foo', 'bar' => true]) // 'foo bar'
+
+// Falsy values get ignored
+classNames('foo', null, 0, false, 1); // 'foo 1'
+```
+
+Objects and functions will be ignored, unless the object has __toString() function.
+If it does that will be called and the string value used.
+
+```
+class ExampleObject {
+    function __toString()
+    {
+        return 'bar';
+    }
+}
+
+classNames('foo', function() {}, new stdClass(), new ExampleObject()); // 'foo bar'
+```
+
+## Laravel Blade
+
+```
+<div class="{{ classNames('foo', ['bar' => true]) }}"></div>
+
+<div class="foo bar"></div>
+```
+
+## License
+
+[MIT](LICENSE). Copyright (c) 2017 Chris Stroud.
diff --git a/composer.json b/composer.json
new file mode 100644
index 0000000..6aaf4aa
--- /dev/null
+++ b/composer.json
@@ -0,0 +1,20 @@
+{
+    "name": "cjstroud/classnames-php",
+    "description": "A simple PHP utility for conditionally joining classNames together",
+    "require-dev": {
+        "phpunit/phpunit": "^6.1"
+    },
+    "license": "MIT",
+    "autoload": {
+        "files": [
+            "src/ClassNames.php"
+        ]
+    },
+    "authors": [
+        {
+            "name": "Chris Stroud",
+            "email": "chris.stroud00@gmail.com"
+        }
+    ],
+    "require": {}
+}
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new file mode 100644
index 0000000..4fe6d1a
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1468 @@
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+                "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": "2017-03-03 06:23:57"
+        },
+        {
+            "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": "2015-07-28 20:34:47"
+        },
+        {
+            "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": "2016-10-03 07:35:21"
+        },
+        {
+            "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": "2017-04-07 12:08:54"
+        },
+        {
+            "name": "webmozart/assert",
+            "version": "1.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozart/assert.git",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozart/assert/zipball/2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "reference": "2db61e59ff05fe5126d152bd0655c9ea113e550f",
+                "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": "2016-11-23 20:04:58"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": [],
+    "platform-dev": []
+}
diff --git a/phpunit.xml b/phpunit.xml
new file mode 100644
index 0000000..c68baf9
--- /dev/null
+++ b/phpunit.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false">
+    <testsuites>
+        <testsuite name="Tests">
+            <directory suffix="Test.php">./tests</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./src</directory>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/src/ClassNames.php b/src/ClassNames.php
new file mode 100644
index 0000000..29d95fa
--- /dev/null
+++ b/src/ClassNames.php
@@ -0,0 +1,48 @@
+<?php
+
+if (!function_exists('classNames')) {
+    function classNames()
+    {
+        $args = func_get_args();
+
+        $data = array_reduce($args, function ($carry, $arg) {
+            if (is_array($arg)) {
+                return array_merge($carry, $arg);
+            }
+
+            $carry[] = $arg;
+            return $carry;
+        }, []);
+
+        $classes = array_map(function ($key, $value) {
+            $condition = $value;
+            $return = $key;
+
+            if (is_int($key)) {
+                $condition = null;
+                $return = $value;
+            }
+
+            $isArray = is_array($return);
+            $isObject = is_object($return);
+            $isStringableType = !$isArray && !$isObject;
+
+            $isStringableObject = $isObject && method_exists($return, '__toString');
+
+            if (!$isStringableType && !$isStringableObject) {
+                return null;
+            }
+
+            if ($condition === null) {
+                return $return;
+            }
+
+            return $condition ? $return : null;
+
+        }, array_keys($data), array_values($data));
+
+        $classes = array_filter($classes);
+
+        return implode(' ', $classes);
+    }
+}
diff --git a/tests/ClassNamesTest.php b/tests/ClassNamesTest.php
new file mode 100644
index 0000000..8db2b31
--- /dev/null
+++ b/tests/ClassNamesTest.php
@@ -0,0 +1,76 @@
+<?php
+
+namespace Tests;
+
+use PHPUnit\Framework\TestCase;
+
+class ClassNamesTest extends TestCase
+{
+    /** @test */
+    public function can_take_single_string_param()
+    {
+        $data = 'test-class';
+
+        $actual = classNames($data);
+        $expected = 'test-class';
+
+        $this->assertEquals($expected, $actual);
+    }
+
+    /** @test */
+    public function can_take_an_array_param()
+    {
+        $data = [
+            'test-class',
+            'test-condition-class' => true,
+            'test-false-condition-class' => false
+        ];
+
+        $actual = classNames($data);
+        $expected = 'test-class test-condition-class';
+
+        $this->assertEquals($expected, $actual);
+    }
+
+    /** @test */
+    public function can_take_multiple_params()
+    {
+        $actual = classNames('test1', ['test2' => true, 'test3' => false], 'test4');
+        $expected = 'test1 test2 test4';
+
+        $this->assertEquals($expected, $actual);
+    }
+
+    /** @test */
+    public function can_handle_erroneous_values()
+    {
+        $example = new ExampleObject('object-test');
+
+        $actual = classNames('null', null, 0, false, 1.5, new \stdClass(), function () {}, $example);
+        $expected = 'null 1.5 object-test';
+
+        $this->assertEquals($expected, $actual);
+    }
+
+    /** @test */
+    public function can_handle_no_args()
+    {
+        $actual = classNames();
+        $expected = '';
+
+        $this->assertSame($expected, $actual);
+    }
+}
+
+class ExampleObject {
+
+    function __construct($value)
+    {
+        $this->stringVal = $value;
+    }
+
+    function __toString()
+    {
+        return $this->stringVal;
+    }
+}