PHP array_intersect_key() Function

The array_intersect_key() function compares the keys of two or more arrays and returns an array containing the keys present in all the arrays.

Key Features of array_intersect_key()

• Compares the keys of arrays.
• Returns an array with matching keys.
• Values are not compared, only the keys matter.
• Supports multiple arrays for comparison.

Syntax of array_intersect_key()

array array_intersect_key(array $array1, array $array2, array ...$arrays);

Example Using array_intersect_key()

The following example demonstrates how array_intersect_key() is used:

$array1 = ["a" => "PHP", "b" => "JavaScript", "c" => "Python"];
$array2 = ["a" => "Ruby", "b" => "Java", "d" => "C++"];

$result = array_intersect_key($array1, $array2);
print_r($result);