PHPignore_user_abort, connection_status, and register_shutdown_function usage

PHPignore_user_abort and connection_status and register_shutdown_function use ignore_user_abort () to implement PHP scheduled task syntax: intignore_user_abort (int [setting]); return value: integer function type: PHP system function description 0-

PHP ignore_user_abort, connection_status, and register_shutdown_function usage
Use ignore_user_abort () to schedule tasks in PHP
Syntax: int ignore_user_abort (int [setting]);
Return value: integer
Function types: PHP system functions
Description
0-NORMAL (NORMAL) 1-ABORTED (abnormal exit) 2-TIMEOUT (TIMEOUT)
Whether the PHP program continues to run after the function is configured or the connection is interrupted. The default value is to stop running after the connection is interrupted.
In the PHP configuration file (php3.ini/php. ini), the ignore_user_abort option is the configuration. This function is available only after PHP 3.0.7.
Ignore_user_abort. This function can help us implement scheduled tasks like cron in linux. you can also execute this function after turning off the browser.
First modify your php. ini, remove the comment "; ignore_user_abort = On", and restart Apache or IIS.
Use sleep (300) + endless loops to implement scheduled tasks. there is no output in this program and it is easy to interrupt the output.
Disadvantage: to stop a program, you must restart the server, which occupies a large amount of memory !!
Ignore_user_abort (true );
Set_time_limit (0 );
While (1 ){
$ Fp = fopen(time_task.txt, "a + ");
$ Str = date ("Y-m-d h: I: s"). "n ";
Fwrite ($ fp, $ str );
Fclose ($ fp );
Sleep (1800); // executed once every 30 minutes
}
?>
PHP code
Ignore_user_abort (true); // enable the function
Set_time_limit (0); // The script is executed infinitely.
$ Interval = 60*2; // execute every two minutes
Do {
// The execution content starts.
File_get_contents ("http://www.liujingze.com/"); // The process to be executed
// The execution content ends.
Sleep ($ interval); // run at the specified interval
} While (true );
?>
PHP scheduled task instance code
Ignore_user_abort ();
Set_time_limit (0 );
$ Interval_second = 15;
Do {
@ $ Fp = fopen ("leapsoulcn.txt", "");
If (! $ Fp)
{
Echo "system error ";
Exit ();
}
Else
{
$ FileData = "domain". "". "www.leapsoul.cn "."";
$ FileData = $ fileData. "description". "". "PHP website development tutorial network for PHP beginners. "."";
$ FileData = $ fileData. "title". "". "this tutorial describes how to use the ignore_user_abort function to schedule tasks in PHP. ";
Fwrite ($ fp, $ fileData );
Fclose ($ fp );
}
Sleep ($ interval_second );
} While (true );
?>

Connection_status
Obtain the connection status.
Syntax: int connection_status (void );
Return value: integer
Function type: Network System
Description
This function returns the connection status. No parameter is required for use.
 
Register_shutdown_function
Define the function to be executed after the PHP program is executed.
Syntax: int register_shutdown_function (string func );
Return value: integer
Function types: PHP system functions
Description
This function defines to the system the function to be executed after the PHP program (Script) is executed. When executing the specified function, it is difficult to debug because the returned value cannot be seen.