Implementation analysis of PHP set_time_limit(0) long connection_PHP tutorial

Each PHP script has a limited execution time, so we need to set the execution time of a script to unlimited through set_time_limit; then use flush() and ob_flush() to clear the server buffer and output the return value of the script at any time.

Such as the following script:

Copy the code The code is as follows:

header("Content-Type: text/plain");
set_time_limit(0);

$infoString = "Hello World" . "n";
while( isset($infoString) )
{
echo $infoString;
flush();
ob_flush();
sleep(5);
}
?>

When we execute, every 5 seconds, we will get a line of Hello World. If you do not press the stop button, the browser will continue to load line by line.

Through this method, we can complete many functions, such as robot crawlers, instant message boards and other programs.

http://www.bkjia.com/PHPjc/321400.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/321400.htmlTechArticleEach PHP script limits the execution time, so we need to set the execution time of a script to unlimited through set_time_limit long; then use flush() and ob_flush() to clear the service...