- print_r: documentation ( source)
- array_udiff: documentation ( source)
<?php
$a = [0, 1, 2, 3, 4, 5, 6];
$b = [4];
print_r(array_udiff($a, $b, function($x, $y) {
return $x <=> $y;
}));
print_r(array_udiff($a, $b, function($x, $y) {
return $x != $y;
}));