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<?php function key_compare_func($key1, $key2) { if ($key1 == $key2) return 0; else if ($key1 > $key2) return 1; else return -1; } $a=new stdClass; $a->{"0"}=1; $a->n=2; var_dump(array_diff_key((array)$a, [0])); var_dump(array_diff_ukey((array)$a, [0], 'key_compare_func'));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { ["n"]=> int(2) } array(1) { ["n"]=> int(2) }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array(1) { ["n"]=> int(2) } array(0) { }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
array(2) { ["0"]=> int(1) ["n"]=> int(2) } array(0) { }

preferences:
214.24 ms | 402 KiB | 326 Q