array_intersect() function in PHP

The array_intersect() function compares array values, and returns the matches. It returns an array containing all of the values in the first array whose values exist in all of the parameters.

Syntax

array_intersect(arr1, arr2, arr3,  arr4, …)

Parameters

• arr1 − Array to compare from. Required.

• arr2 − Array to compare against. Required.

• arr3 − You can add more arrays to compare. Optional.

• arr4 − You can add more arrays to compare. Optional.

Return

The array_intersect() function returns an array containing all of the values in the first array whose values exist in all of the parameters.

Example

<?php
   $a1 = array("p"=>"Windows","q"=>"Mac","r"=>"Linux");
   $a2 = array("s"=>"Windows","t"=>"Linux");
   $result = array_intersect($a1,$a2);
   print_r($result);
?>

Output

Array 
(
   [p] => Windows
   [q] => Linux
)

Let us see another example.

Example

<?php
   $arr1 = array(15, 30, 40, 60, 78, 100, 130, 145, 150);
   $arr2 = array(50, 60, 70, 80, 90, 100);
   $res = array_intersect($arr1,$arr2);
   print_r($res);
?>

Output

Array 
( 
   [3] => 60
   [5] => 100
)