Definition
The array_intersect_key() 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.
Syntax
array_intersect_key(array1, array2, array3, ...)
Parameters
| Parameter | Description |
|---|---|
array1 |
Required. The array to compare from. |
array2 |
Required. An array to compare against. |
array3 |
Optional. More arrays to compare against. |
Example
<?php
$ages1 = array("Mark" => 22, "Jeff" => 32, "Mike" => 28);
$ages2 = array("Fred" => 22, "John" => 32, "Robin" => 28);
$ages3 = array("Mark" => 23, "John" => 32, "Mike" => 36);
$result = array_intersect_key($ages1, $ages2);
print_r($result);
echo "<br>";
$result = array_intersect_key($ages1, $ages3);
print_r($result);
echo "<br>";
$result = array_intersect_key($ages1, $ages2, $ages3);
print_r($result);
echo "<br>";