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PHP array_intersect_key() Function

PHP array_intersect_key() Function

Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_intersect_key() Function.

The array_intersect_key() function returns an array containing all the values of array1 which have matching keys that are present in all the arguments.


Following below is the syntax to use this function -

array array_intersect_key ( array $array1, array $array2 [, array $array3 ...] );

Parameter Details

Sr.NoParameter & Description


The first array is the array that the others will be compared with.



This is an array to be compared with the first array



This is an array to be compared with the first array

Return Value

It returns False if there is any error.


Try out the below example -

   $input1 = array('black'  => 1, 'red'  => 2, 'green'  => 3 );
   $input2 = array('green' => 4, 'black' => 5, 'pink' => 6,);
   $result = array_intersect_key($input1, $input2);


When the above code is executed, it will produce the following result -

Array ( [black]  => 1 [green] => 3 )

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the built-in array_intersect_uassoc() Function in PHP.

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