The difference between PHP require and include

Include and require always go the same logic, only in the 7th step to distinguish between the judgment
Instructions on the manual:

Require and include are almost exactly the same, in addition to handling failures differently. Require generates an E_COMPILE_ERROR level error when an error occurs. In other words, the script aborts and the include generates only warnings (e_warning), and the scripts continue to run.

It is clear from the manual that the only difference between them is that the require error will abort the script, then why there are different versions of the Internet, so it is necessary to end from the source.

To do the source tracking, first understand the approximate operating principle of PHP: PHP code, code scanning, code translation----Zend VM execution, output

The require_once () and include_once () statements are primarily used when you need to include multiple files, and you can effectively avoid errors where the same piece of code is included in a function or variable that is repeatedly defined.

Require use methods such as require ("myrequirefile.php");. This function is usually placed at the front of the PHP program, and before the PHP program executes, it is read into the file specified by require to make it a part of the PHP program's Web page. Commonly used functions, you can also use this method to introduce it into the Web page.

Include usage methods such as include ("myincludefile.php");. This function is usually placed in the processing part of the process control. The PHP Program page reads the include file before it is read in. This way, you can simplify the process when the program executes.

The difference between PHP require and include