<?php
$array1 = array(
array('ITEM' => 1),
array('ITEM' => 2),
array('ITEM' => 3),
);
$array2 = array(
array('ITEMID' => 2),
array('ITEMID' => 3),
array('ITEMID' => 1),
array('ITEMID' => 4),
);
// PHP7.4+ (arrow functions)
var_export(
array_udiff($array2, $array1, fn($a, $b) => ($a['ITEM'] ?? $a['ITEMID']) <=> ($b['ITEM'] ?? $b['ITEMID']))
);
preferences:
37.65 ms | 402 KiB | 5 Q