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<?php function forget(&$array, $keys) { $original =& $array; foreach ((array) $keys as $key) { $parts = explode('.', $key); while (count($parts) > 1) { $part = array_shift($parts); if (isset($array[$part]) && is_array($array[$part])) { $array =& $array[$part]; } } unset($array[array_shift($parts)]); // clean up after each pass $array =& $original; } } print_r(forget(['a' => 0, 'b' => 'd']), ['b']);
Output for git.master, git.master_jit
Fatal error: Uncaught Error: forget(): Argument #1 ($array) could not be passed by reference in /in/CL0Kq:29 Stack trace: #0 {main} thrown in /in/CL0Kq on line 29
Process exited with code 255.
Output for rfc.property-hooks
Fatal error: Uncaught Error: forget(): Argument #1 ($array) cannot be passed by reference in /in/CL0Kq:29 Stack trace: #0 {main} thrown in /in/CL0Kq on line 29
Process exited with code 255.

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