Wraps function declaration to avoid redeclare error

src/transform.php

@@ -9,85 +9,90 @@
 
 namespace Pitchart\Transformer;
 
-/**
- * Prepares a transformation for a collection of items
- *
- * @param array|\Traversable $iterable
- * @param Composition $composition
- * @param Termination $termination
- * @param mixed $initial
- *
- * @return Transformer
- */
-function transform($iterable, Composition $composition = null, Termination $termination = null, $initial = null)
-{
-    return (new Transformer($iterable, $composition, $termination, $initial));
-}
+if (!function_exists(__NAMESPACE__.'\transform')) {
 
-/**
- * Alias for transform()
- *
- * @see transform()
- * @param mixed $iterable
- * @param null|mixed $initial
- */
-function from($iterable, Composition $composition = null, Termination $termination = null, $initial = null)
-{
-    return transform($iterable, $composition, $termination, $initial);
-}
+    /**
+     * Prepares a transformation for a collection of items
+     *
+     * @param array|\Traversable $iterable
+     * @param Composition $composition
+     * @param Termination $termination
+     * @param mixed $initial
+     *
+     * @return Transformer
+     */
+    function transform($iterable, Composition $composition = null, Termination $termination = null, $initial = null)
+    {
+        return (new Transformer($iterable, $composition, $termination, $initial));
+    }
 
-/**
- * Creates a composition of functions
- *
- * @param \callable[] ...$callbacks
- *
- * @return Composition
- */
-function compose(callable ...$callbacks)
-{
-    return new Composition(...$callbacks);
-}
+    /**
+     * Alias for transform()
+     *
+     * @see transform()
+     *
+     * @param mixed $iterable
+     * @param null|mixed $initial
+     */
+    function from($iterable, Composition $composition = null, Termination $termination = null, $initial = null)
+    {
+        return transform($iterable, $composition, $termination, $initial);
+    }
 
-/**
- * @param mixed $value
- *
- * @return mixed
- */
-function identity($value)
-{
-    return $value;
-}
+    /**
+     * Creates a composition of functions
+     *
+     * @param \callable[] ...$callbacks
+     *
+     * @return Composition
+     */
+    function compose(callable ...$callbacks)
+    {
+        return new Composition(...$callbacks);
+    }
 
-/**
- * Transforms a function into a pure function
- *
- * @param callable $function
- * @param array ...$arguments
- *
- * @return mixed
- */
-function curry(callable $function, ...$arguments)
-{
-    return (new Curry($function))(...$arguments);
-}
+    /**
+     * @param mixed $value
+     *
+     * @return mixed
+     */
+    function identity($value)
+    {
+        return $value;
+    }
 
-/**
- * Creates a comparison function for a callable criterion
- * The created function can be used with usort(), uasot() and uksort()
- *
- * @param callable $callback
- *
- * @return \Closure
- */
-function comparator(callable $callback)
-{
-    return function ($first, $second) use ($callback) {
-        $first = ($callback)($first);
-        $second = ($callback)($second);
-        if ($first == $second) {
-            return 0;
-        }
+    /**
+     * Transforms a function into a pure function
+     *
+     * @param callable $function
+     * @param array ...$arguments
+     *
+     * @return mixed
+     */
+    function curry(callable $function, ...$arguments)
+    {
+        return (new Curry($function))(...$arguments);
+    }
+
+    /**
+     * Creates a comparison function for a callable criterion
+     * The created function can be used with usort(), uasot() and uksort()
+     *
+     * @param callable $callback
+     *
+     * @return \Closure
+     */
+    function comparator(callable $callback)
+    {
+        return function ($first, $second) use ($callback) {
+            $first = ($callback)($first);
+            $second = ($callback)($second);
+            if ($first == $second) {
+                return 0;
+            }
+
+            return $first < $second ? -1 : 1;
+        };
+    }
 
-        return $first < $second ? -1 : 1;
-    };
-}
+}