How to secure PHP pages?

Question

Hello everybody.
I like to learn web developing in advance and my choise in the back-end language is PHP. Although any web page have to be secured, but consider I'm developing web pages in PHP, I like to learn ways to secure a PHP page more and more.
So, please help me. Thanks if you introduce books or courses about PHP security (specially), but if you have information or experience in this case, I would be grateful.
Thanks everyone!

Answer 1

A suggestion for myself! (and anybody else):

http://php.net/manual/en/security.php

Answer 2

@Hasan Al-Yazidi Thanks a lot!

Answer 3

i do recomend to see youtube video about this

Answer 4

Have a read:
https://php.earth/doc/security/intro

Answer 5

Any other suggestions?

Answer 6

No other references?