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    <p>Just thought I'd point out that this is a fold, so array_reduce can be used:</p> <pre><code>array_reduce($my_array, 'array_merge', array()); </code></pre> <p>EDIT: Note that this can be composed to flatten any number of levels. We can do this in several ways:</p> <pre><code>// Reduces one level $concat = function($x) { return array_reduce($x, 'array_merge', array()); }; // We can compose $concat with itself $n times, then apply it to $x // This can overflow the stack for large $n $compose = function($f, $g) { return function($x) use ($f, $g) { return $f($g($x)); }; }; $identity = function($x) { return $x; }; $flattenA = function($n) use ($compose, $identity, $concat) { return function($x) use ($compose, $identity, $concat, $n) { return ($n === 0)? $x : call_user_func(array_reduce(array_fill(0, $n, $concat), $compose, $identity), $x); }; }; // We can iteratively apply $concat to $x, $n times $uncurriedFlip = function($f) { return function($a, $b) use ($f) { return $f($b, $a); }; }; $iterate = function($f) use ($uncurriedFlip) { return function($n) use ($uncurriedFlip, $f) { return function($x) use ($uncurriedFlip, $f, $n) { return ($n === 0)? $x : array_reduce(array_fill(0, $n, $f), $uncurriedFlip('call_user_func'), $x); }; }; }; $flattenB = $iterate($concat); // Example usage: $apply = function($f, $x) { return $f($x); }; $curriedFlip = function($f) { return function($a) use ($f) { return function($b) use ($f, $a) { return $f($b, $a); }; }; }; var_dump( array_map( call_user_func($curriedFlip($apply), array(array(array('A', 'B', 'C'), array('D')), array(array(), array('E')))), array($flattenA(2), $flattenB(2)))); </code></pre> <p>Of course, we could also use loops but the question asks for a combinator function along the lines of array_map or array_values.</p>
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    1. POHow to Flatten a Multidimensional Array?
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    1. COMulti-dimensional != bi-dimensional.
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    2. COthis doesn't work: http://www.php.net/manual/en/function.array-reduce.php#90015
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    3. CO@atamur This works on PHP 5.3+. As noted in the changelog for array_reduce, $initial could only be an integer before 5.3, then it was allowed to be "mixed" (ie. anything your reduction function supports)
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