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<?php function format(&$collection) { $collection["prefix"] = 'ass'; } $collection = array('a' => 1, 'b' => 2, 'c' => 3); call_user_func_array('format', array($collection)); var_dump($collection);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: format(): Argument #1 ($collection) must be passed by reference, value given in /in/OuMOm on line 6 array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) }

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