- print_r: documentation ( source)
- array_filter: documentation ( source)
- in_array: documentation ( source)
- array_keys: documentation ( source)
<?php
$mergeInfo = array(1 => 2 , 2 => 2 , 3 => 4);
$campusAddressIds = array_filter(array_keys($mergeInfo) , function ($key) use ($mergeInfo) {
return !in_array($key , $mergeInfo);
});
print_r($campusAddressIds);