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<?php $a = array('a' => array(0 => 1, 1 => 2) ,'b' => array(0 => 3, 1 => 4)); print_r(array_reduce($a, 'array_merge', $a));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => Array ( [0] => 1 [1] => 2 ) [b] => Array ( [0] => 3 [1] => 4 ) [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

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