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...)

Parameters	Description
array1	Required. The first array to compare with other arrays.
array2	Required. The array to compare to the first array.
array3	Optional. The array to compare to the first array. There can be multiple.

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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