PHP array_intersect() function

Example

Compares the key values ​​of two arrays and returns the intersection:

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array( "e"=>" red","f"=>"green","g"=>"blue");$result=array_intersect($a1,$a2);print_r($result);?>

Definition and usage

The array_intersect() function is used to compare the key values ​​of two (or more) arrays and return the intersection.

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

grammar

 array_intersect( array1,array2,array3... );

parameter	describe
array1	Required. The first array to compare with other arrays.
array2	Required. The array to compare to the first array.
array3,...	Optional. Additional array to compare with the first array.

technical details

Return value:	Returns an intersection array containing all keys in the compared array ( array1 ) and any other parameter arrays ( array2 or array3 , etc.).
PHP version:	4.0.1+

More examples

Example 1

Compare the key values ​​of three arrays and return the intersection:

<?php$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");$a2=array( "e"=>"red","f"=>"black","g"=>"purp le");$a3=array("a"=>"red","b"=>"black","h"=>"yellow");$result=array_intersect($a1,$a2,$a3 );print_r($result);?>