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php The function of exit is to output a message and exit the current script. The exit function is an alias of the die() function. Its usage syntax is "exit(status)". The status parameter specifies to be written before exiting the script. message or status number.
The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer
exit() function outputs a message and exits the current script.
This function is an alias of the die() function.
Syntax
exit(status)
Parameters
status Required. Specifies the message or status number to be written before exiting the script. Status numbers are not written to the output.
Description
If status is a string, the function will output the string before exiting.
If status is an integer, this value will be used as the exit status. The exit status value is between 0 and 254. Exit status 255 is reserved by PHP and will not be used. Status 0 is used to terminate the program successfully.
Tips and Notes
Note: If the version number of PHP is greater than or equal to 4.2.0, then when status is an integer, this parameter will not be output.
Example
<?php $site = "http://www.w3school.com.cn/"; fopen($site,"r") or exit("Unable to connect to $site"); ?>
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