PHP 4+ built-in string hashing functions:

PHP 4+ built-in string hashing functions:
* https://www.php.net/manual/en/function.md5.php

md5(
  string $string, // 'cacca'
  bool $binary = false,
): string         // => 'c21a7f50739500292ab24dd37150fa8a'

PHP 4.30+:
* https://www.php.net/manual/en/function.sha1.php

sha1(
  string $string, // 'cacca'
  bool $binary = false,
): string         // => '9092f13daa057447ae12f307e072ca0a67e970f1'