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<?php $a1 = [ ['target_id' => 123], ['target_id' => 234], ['target_id' => 345], ]; $a2 = [ ['target_id' => 123, 'type' => 'node'], ['target_id' => 234, 'type' => 'node'], ['target_id' => 345, 'type' => 'node'], ]; var_dump(array_intersect($a1, $a2));

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