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<?php $a = ["1","2"]; $b = ["2",3=>[]]; $out = array_udiff($a, $b, function($c, $d) { static $i = 0; echo ++$i. @": $c != $d= ".$c != $d.PHP_EOL; return $c != $d; }); var_dump($out);
Output for git.master, git.master_jit, rfc.property-hooks
1 Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/aULfj on line 5 Warning: Array to string conversion in /in/aULfj on line 7 1 Warning: Array to string conversion in /in/aULfj on line 7 1111array(1) { [0]=> string(1) "1" }

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