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<?php $ar = array('a' => 'b'); function cb($v) { return $v; } function keys($v, $k) { return $k; } print_r(array_map('cb', $ar)); print_r(array_map('cb', $ar, array_keys($ar))); $keys = array_map('keys', $ar); print_r(array_map('cb', $ar, $keys));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => b ) Array ( [0] => b ) Fatal error: Uncaught ArgumentCountError: Too few arguments to function keys(), 1 passed and exactly 2 expected in /in/6ljW4:5 Stack trace: #0 [internal function]: keys('b') #1 /in/6ljW4(9): array_map('keys', Array) #2 {main} thrown in /in/6ljW4 on line 5
Process exited with code 255.

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