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<?php $a1 = [ ['target_id' => 124], ['target_id' => 234], ['target_id' => 345], ]; $a2 = [ ['target_id' => 123, 'type' => 'node'], ['target_id' => 234, 'type' => 'node'], ['target_id' => 345, 'type' => 'node'], ]; var_dump(array_udiff($a1, $a2, function ($a, $b) { return 0; }));
Output for 5.6.30
array(0) { }