You seemingly don't understand a bit about it. And you seemingly doesn't understand how crypt works. Let me educate you:

1. When user registers, his password is hashed with that hash-function, and that hash is stored in a database (it uses random salt).

2. When user tries to access the site, a password is hashed against the hash stored in a database, and it should return same hash if matched (this is how crypt works!).

3. In non strict mode we try also two different passwords to match the hashes (just like Facebook does).

Code example:

1. $hash = \password\hash('user entered password'); // store it to db

2. retrieve hash from db, and check it:

$valid = \password\check('user entered password', $hash, false);

3. // Now these passwords are valid:

'user entered password' // == correct form

'User entered password' // == Mobile browser capitalizing first char

'USER ENTERED PASSWORD' // == CAPS LOCK on

And one line example:

$valid = \password\check('user entered password', \password\hash('user entered password'), false); // == true