Here's a little wrapper for array_diff - I found myself needing to iterate through the edited array, and I didn't need to original keys for anything.
<?php
function arrayDiff($array1, $array2){
# This wrapper for array_diff rekeys the array returned
$valid_array = array_diff($array1,$array2);
# reinstantiate $array1 variable
$array1 = array();
# loop through the validated array and move elements to $array1
# this is necessary because the array_diff function returns arrays that retain their original keys
foreach ($valid_array as $valid){
$array1[] = $valid;
}
return $array1;
}
?>