sleep() in for/ while... loop

[stijn0713]

This little experiment totally blew my mind. Apparently the number are only echoed when the for loop in completely ended. Why is this and how can i obtain a number being printed after the number's amount in seconds?

 

for( $y=0; $y<=10; $y++ ){
sleep($y);
echo $y.'<br>';
}

[premiso]

The reasoning is because the browser holds all output until the end of processing to display a complete document, or the content is flushed. However, flushing only works on some browsers.

 

Take a look at flush and ob_flush to learn more about flushing. If this was ran in CLI (command line interface), you would see the output as expected. 

Edited January 15, 2013 by premiso

[stijn0713]

thanks!