array_diff in PHP

PHP array_diff() function returns an array consisting only of those values present in the first input array and not present in any other arrays.

Syntax:  array_diff(array1,array2,array3...)

Parameters Description:
array1 : Required. The first array will be compared with other arrays.
array2 : Required. An array to be compared with the first array.
array3 : Optional. An array to be compared with the first array.

Tip : The first array can compare with single array or more arrays.
Note : Compare only values of the array.

Example:

<?php
$daysarr1 = array(0=>"Sunday",1=>"Monday",2=>"Tuesday",3=>"Wednesday");
$daysarr2 = array(4=>"Monday",5=>"Tuesday",6=>"Friday");
print_r( array_diff($daysarr1,$daysarr2) );
?>

Output:

Array (
          [0] => Sunday
          [3] => Wednesday
       )