Definition:
The symbol of this operator is !==.
If you use this operator in the program, it first matches the key and value of the first array with the other array in the same order.
If the values do not match in the same order, it returns true; otherwise, it returns false as output.
Syntax:
$array1 !== $array2
Example:
<?php
$array1 = array("a" => "Pen", "b" => "Copy");
$array2 = array("b" => "Pen", "a" => "Copy");
var_dump($array1 !== $array2);
?>
Output:
bool(true)