We can't tell - we don't have any access to your data, and that is probably significant.
So it's going to be up to you. Start with the documentation:
PHP: password_verify - Manual[
^] which says that the second parameter is a hashed value created by the
password_hash
function - so look at what the actual data returned from your DB looks like to see if it is in any way comprehensible. If it isn't, that's probably a good thing! :D
If it is the user password, then your registration system is the problem and you need to store a hashed value instead of straight text - so go look at how that works.
If it is incomprehensible, then use the
password_hash
function exactly as you did in your registration code on the newly entered password and see if the results match visually.
Sorry, but we can't help you with this - we have no access to your DB, to your registration code, or any idea what data the
$_POST
is supplying to your code!