Comparing passwords with crypt() in PHP

Question

I need to get the basics of this function. The php.net documentation states, for the blowfish algorithm, that:

Blowfish hashing with a salt as follow

Answer 1

Quoting from the manual

CRYPT_BLOWFISH - Blowfish hashing with a salt as follows: "$2a$", a two digit cost parameter, "$", and 22 base 64 digits from the alphabet

Note: 22 base 64 digits