Generate unique, random tokens and secure hashes in PHP

Taken from the course "Build a Complete Registration and Login System using PHP MVC".

How to generate unique, random strings in PHP, and how to create secure hash values of those tokens.

[pranabroy]

with an example of this could be even better.

[mr.RAND]

i wish the disliker explain why they click the dislike button. What would be the reason? We need a secure website. Is there something flaw in his explaining?

[weshuiz]

hashing the same word with the same algoritm always give the same hash back
this can be abused to decrypt a hash make sure to salt them