<?php $a = ['a' => '123', 'b' => '321', 'c' => ['asdf' => 'asdf']]; $b = ['a' => '123', 'b' => '123', 'c' => ['asdf' => 'asdf123']]; $r = array_udiff_assoc($a, $b, function($old, $new) { var_dump($old, $new); return $new == $old ? 0 : -1; }); var_dump($r);
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