What is the difference between PHP return and exit?

The difference between PHP return and exit: 1. Return is at the language level, which represents the return of the call stack, while exit is at the system call level, which represents the end of a process. 2. Return is the exit of the function, and exit is the exit of the process.

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The difference between PHP return and exit:

die(): stops when an error is encountered, stops the program running, and outputs the content (yes Program level)

exit(): is a function

is to stop the program running, the former does not output content; the latter outputs content (program level)

exit(0): Run the program normally and exit the program;

exit(1): Exit the program due to abnormal operation;

return: just a keyword

return is a pure return value, but it will not run subsequent code (at the function level)

Additional:

1. Return is at the language level, which represents the return of the call stack; exit is at the system call level, which represents the end of a process.

2. Return is the exit (return) of the function; exit is the exit of the process.

3. Return is provided by C language, and exit is provided by the operating system (or given in the function library).

4. Return is used to end the execution of a function and transfer the execution information of the function to other calling functions;

The exit function is to exit the application and delete the memory space used by the process. And returns a status of the application to the OS. This status identifies some running information of the application. This information is related to the machine and operating system. Generally, 0 means a normal exit, and non-0 means an abnormal exit.

5. The effect of calling return and exit in non-main function is very obvious, but the phenomenon of calling return and exit in main function is very vague. In most cases, the phenomenon is the same

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