Shulou(Shulou.com)06/03 Report--

The purpose of this article is to share with you what are the knowledge points that PHP is easy to forget. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

1. Define constant:

The copy code is as follows:

2. The difference between require and require_once:

The former encounters the include file, while the latter determines whether it has been included, and if so, the file is no longer included. First, it can save resources, and second, it can avoid the error of repeated definition.

3. The difference between include and include_once:

Both function and function can include one page into another page, the former can contain multiple times, and the latter can only contain once.

4. The difference between include and require (both include_once and require_once)

Same: all can be introduced to other pages

Different: if there is an error in include, it will continue to execute, and if there is an error in require, the program will be terminated.

Conclusion: basically use require_once when working on a project and write it at the front of PHP.

5. Variables are case-sensitive in PHP, but not case-sensitive when defining functions.

The copy code is as follows:

6. Set the character set to UTF-8 during mysql installation, but if you cannot add Chinese data to the table in the mysql client (the interface entered by cmd), you can set it as follows:

Thank you for reading! This is the end of this article on "what are the knowledge points easy to forget in PHP?". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it out for more people to see!

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