Where can i find a PHP Redirect Script like this?

<?php

// set string length here
$randomStringLength = 10;

$randomString = "";
$randomChars = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
$randomCharsCount = strlen($randomChars) - 1;

for ($i = 0; $i < $randomStringLength; $i++) {
$randomString .= $randomChars[rand(0, $randomCharsCount)];
}

header("Location: https://google.com?q=" . $randomString);
exit();

?>