Include| distinguishes the use of header files in PHP, which involves two functions: include () and require (). These two functions are very small, but very important, so we have to study carefully. The Require () function works like a xssi, and regardless of which part of the program is used, the contents of the header file are processed as part of the program itself, as soon as the program starts running. Therefore, if you use the Require () function in a conditional decision statement, the header file is included even if the condition is not true.
The Include () function only contains the contents of the head file when executing to this statement. If the program is not running here, PHP will not be able to control it. This means that when you use include in the Conditional decision section, it works exactly the way you want it to.
Also, if you use the Require () function and the header file you specified does not exist, the program will stop running and produce an error. If you use include (), the program will produce a warning message, but it will continue to run.
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