PHP array_intersect_key() Function

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php php array function
PHP array_intersect_key() Function

The array_intersect_key() is used to create an array containing keys and values of the first array whose keys (i.e. from the first array) are present in all other arrays.

This function compares the keys of two or more arrays, and return an array that contains the entries from array1 that are present in array2, array3, etc.

Parameter Description
array1 Required. The first array is the array that the others will be compared with
array2 Required. An array to be compared with the first array
array3,... Optional. An array to be compared with the first array

Syntax

 array_intersect_key(array1,array2,array3...) 

Example

$array1=array("a"=>"Samuel","b"=>"Cooper","c"=>"James","d"=>"Alex");
$array2=array("a"=>"Samuel","b"=>"Cooper","g"=>"James");
$array3=array("a"=>"Samuel","b"=>"Cooper","g"=>"James");
$result=array_intersect_key($array1,$array2,$array3);
print_r($result);

Output

Array ( [a] => Samuel [b] => Cooper ) 

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