Differences between include and require in php

: This article mainly introduces the differences between include and require in php. For more information about PHP tutorials, see. The following describes the differences between the include () and require () statements in PHP code:

1. different loading methods and error handling methods

• The include () statement can be placed in the process control of the program. when the program is executed, the file is loaded in. When an error occurs (such as the file does not exist), only one warning is generated.

• The require () statement is usually placed at the beginning of the program, and the program loads the file during execution. If an error occurs (if the file does not exist), the script is terminated.

2. php performance

• The inlcude () statement reads and evaluates files every time it is executed.
• The require () statement only processes files once (in fact, the file content replaces the require () statement.

3. include_once () and require_once ()

• Include_once () includes and runs the file during the script execution period. if the file is included, it is not included again.

• Require_once () checks whether the file has been loaded during script execution. If the file is not loaded again, for example, if a file defines a type, an error occurs when the file is loaded twice.

'). AddClass ('pre-numbering '). hide (); $ (this ). addClass ('Has-numbering '). parent (). append ($ numbering); for (I = 1; I <= lines; I ++) {$ numbering. append ($ ('

'). Text (I) ;}; $ numbering. fadeIn (1700) ;}) ;}; script

The above introduces the differences between include and require in php, including the content, and hope to be helpful to friends who are interested in PHP tutorials.