Syntax of array_intersect_key in PHP
array array_intersect_key(array array1, array array2[, … array arrayN])
Example of array_intersect_key in PHP
<?php
$array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4);
$array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8);
var_dump(array_intersect_key($array1, $array2));
?>
array(2) {
["blue"]=>
int(1)
["green"]=>
int(3)
}