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run code in 150+ php & hhvm versions
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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)); $keys = array_map('keys', $ar, array_keys($ar)); print_r($keys); //print_r(array_map('cb', $ar, $keys));
based on gSNgV
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => a )
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/ccf9j on line 10
Process exited with code 255.