Question

I know there are MD5 and SHA1 hashing functions in PHP, but are there any others?

Answer 1

Use

<?php
print_r(hash_algos());
?>

This prints a list of all available hashing-algorithms that are available on your system. Chose one and provide it as the first parameter to the hash-function like this:

hash('whirlpool', $the_data_to_be_hashed);