- print_r: documentation ( source)
- array_diff: documentation ( source)
<?php
$i = [
0 => 1,
1 => 2,
2 => 3,
3 => 4,
4 => 5,
];
$e = [
110 => 1,
111 => 2,
112 => 3,
113 => 3,
114 => 3,
115 => 8,
116 => 9
];
print_r(array_diff($i, $e));
print_r(array_diff($e, $i));