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<?php $arr = array('a' => 'b'); array_walk($arr, function ($val, &$key) { $key = ':'.$key; }); var_export($arr);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #2 ($key) must be passed by reference, value given in /in/u86ul on line 4 array ( 'a' => 'b', )

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