Online PHP editor | output for mRaTq

<?php $array1 = [ 'abc' => 46, 'def' => 134, 'xyz' => 34, //'qwe' => 39, ]; $array2 = [ 'abc' => 46, 'def' => 134, 'xyz' => 34, 'qwe' => 39, ]; function allKeysFoundInBothArrays(array $array1, array $array2): bool { foreach ($array1 as $key => $notUsed) { echo "checking $key in \$array2\n"; if (!key_exists($key, $array2)) { return false; } unset($array2[$key]); } foreach ($array2 as $key => $notUsed) { echo "checking $key in \$array1\n"; if (!key_exists($key, $array1)) { return false; } } return true; } var_export(allKeysFoundInBothArrays($array1, $array2));