<?php $big_array = [ [ ['correct' => FALSE, 'answer' => 'false answer1'], ['correct' => FALSE, 'answer' => 'false answer2'], ['correct' => FALSE, 'answer' => 'false answer3'], ['correct' => TRUE, 'answer' => 'correct answer'], ] ]; $small_array = [ [ ['correct' => FALSE, 'answer' => 'false answer1'], ] ]; var_export( array_map( fn($bigSet, $smallSet) => array_udiff( $bigSet, $smallSet, fn($a, $b) => $a <=> $b ), $big_array, $small_array ) );
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Value for `_results` contains invalid data `array`