php array_intersect() function example usage

array_intersect() Function is used to compare two (or more) arrays key value and return the intersection.

This function compares the key values ​​​​of two (or more) arrays and returns the intersection array, which includes everything in the compared array (array1), as well as in any other parameter array ( key values ​​in array2 or array3 etc.).

Description

array_intersect() function returns the intersection array of two or more arrays.

The result array contains all values ​​that are in the compared array and also appear in all other parameter arrays, and the key names remain unchanged.

Note: Only values ​​are used for comparison.

Syntax

array_intersect(array1,array2,array3...)

Example

The code is as follows:

<?php 
$a1=array(0=>"Cat",1=>"Dog",2=>"Horse"); 
$a2=array(3=>"Horse",4=>"Dog",5=>"Fish"); 
print_r(array_intersect($a1,$a2)); 
?>

Output:

Array ( [1] => Dog [2] => Horse )

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