Returning from Included Files in PHP
In PHP, when a script includes another script using the include() function, the execution of the including script is paused while the included script is executed. Normally, the execution of the including script resumes after the included script has completed. However, what if you want to return from the included script and resume execution in the including script?
The include() Function
The include() function is used to include and execute the specified file as part of the current script. When using include(), if the included script contains a return statement, the execution of the including script does not resume. Instead, include() returns NULL to the calling script.
Returning from an Included Script
To return from an included script back to the including script, you can use the exit() function. exit() immediately terminates the execution of the current script and returns the specified exit code to the caller. By using exit() in the included script, you can force the including script to resume execution.
Example
Consider the following example:
application.php:
<code class="php">$page = "User Manager";
if($permission["13"] !=='1'){
include("/home/radonsys/public_html/global/error/permerror.php");
exit();
}</code>
permerror.php:
<code class="php"><?php exit();</code>
In this example, if the condition in application.php is not met, the permerror.php script is included. Inside permerror.php, the exit() function is used to terminate the execution of the current script (i.e., permerror.php) and return the execution to application.php. As a result, the script execution will resume at the line following include() in application.php.
Other Options
Besides using exit(), you can also use the require or require_once functions to include scripts. These functions behave similarly to include() but generate a fatal error if the file cannot be found or included.
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