PHP ignore_user_abort and connection_status and register_shutdown_fu_PHP tutorial

PHP ignore_user_abort and connection_status and register_shutdown_function Usage
Use ignore_user_abort() to implement PHP scheduled tasks
Syntax: int ignore_user_abort(int [setting]);
Return value: integer
Function type: PHP System function
Content description
0 - NORMAL (normal) 1 - ABORTED (abnormal exit) 2 - TIMEOUT (timeout)
This function configures or obtains whether the PHP program will continue to execute after the user connection is interrupted. The default value is to stop execution after disconnecting.
The ignore_user_abort option in the PHP configuration file (php3.ini/php.ini) is the configuration location. This feature is only available after PHP version 3.0.7.
ignore_user_abort, this function can help us implement scheduled tasks like cron in Linux, and it can still be executed after the user closes the browser.
First modify your php.ini, remove the comment ";ignore_user_abort = On", and restart Apache or IIS.
Use sleep(300) + infinite loop to implement scheduled tasks. There should be no output in this program. If there is output, it will be easily interrupted.
Disadvantages: To stop the program, you must restart the server, which takes up a lot 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); / /Execute once every half hour
}
?>
PHP code
ignore_user_abort(true); // Enable function
set_time_limit(0); // Unlimited Number of times to execute the script
$interval=60*2; // Execute once every two minutes
do{
// Start of execution
file_get_contents("http://www.liujingze.com/ "); // The process that needs to be executed
// The content to be executed ends
sleep($interval); // Execute according to the set interval
}while(true);
?>
PHP scheduled task example code
ignore_user_abort();
set_time_limit(0);
$interval_second = 15;
do{
@$fp = fopen ("leapsoulcn.txt","a");
if(!$fp)
{
echo "system error";
exit();
}
else
{
$fileData = "domain"." "."www.leapsoul.cn"." ";
$fileData = $fileData."description"." "."PHP website development tutorial website, a PHP tutorial website for PHP beginners. "." ";
$fileData = $fileData."title"." "."This tutorial mainly talks about using the ignore_user_abort function to implement the PHP scheduled task function. ";
fwrite($fp, $fileData);
fclose($fp);
}
sleep($interval_second);
}while(true);
?> ;

connection_status
Get the connection status.
Syntax: int connection_status(void);
Return value: integer
Function type: Network system
Content description
This function can return the connection status. There is no need to enter parameters when using it

register_shutdown_function
defines the function to be executed after the PHP program is executed.
Syntax: int register_shutdown_function(string func);
Return value: integer
Function type: PHP system function
Content description
This function defines to the system what is required after the PHP program (Script) is executed function to execute. When the specified function is executed, debugging is difficult because the return value cannot be seen.

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