$arr1=array(23,43,54);
$arr2=array(34,23,3456,43,11,54);
I want to get elements of $arr2 that's not in $arr1
array_diff() is your man. http://php.net/manual/en/function.array-diff.php
Take a look at: http://www.php.net/manual/en/function.array-diff.php
Try this:
$new_arr = array_diff($arr2, $arr1);
Hmmm, if that doesn't work, switch $arr1 and $arr2 around.