What do you need to know before learning PHP?

Because PHP is currently mainly used for network applications. That is, websites, etc. So it's better to know some HTML, CSS, JavaScript. Then you also need to understand MySQL (that is, SQL statements). Finally started learning PHP.

html, css, and javascript are mainly used to make front-end pages. They are the face of the web page you make and the part closest to the user, so you still need to have the necessary understanding. And for small companies, everything from page design, page layout, art, and back-end processing are all completed by one or several people, without a clear division of labor; so it must be both front-end and back-end. In large companies, although there is a clear division of labor, although you are not required to write these things at the front desk, you must be able to read them.

What mysql needs to master is SQL statements, which are nothing more than adding, deleting, checking, and database optimization. These are relatively simple and fast to learn, and they are also knowledge that must be mastered.

As for ajax and jQuery, when you have learned PHP to a certain extent, you can consider learning these, because ajax is used in many large projects, especially chat rooms.

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