- print_r: documentation ( source)
- array_diff_ukey: documentation ( source)
<?php
$a = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$b = array("a" => "green", "yellow", "red");
$c = array("c" => "blue");
print_r(array_diff_ukey($a, $b, $c, function($a, $b){
if ($a == $b) {
return 0;
}
return $a > $b ? 1 : -1;
}));