PHP flush() Function

Example

Output a string to the browser before the script has finished running:

<?php
// Some browsers will not display the content if it is too short
// We use str_pad() to make the output long enough
echo str_pad("Hello World!", 4096);

// Use flush() to send the string to the browser
flush();

// Display the rest of the content three seconds later
sleep(3);
echo "<br>";
echo "Hello World!";
?>

Try it Yourself »

Definition and Usage

The flush() function requests the server to send its currently buffered output to the browser. The server configuration may not always allow this to happen.

Syntax

flush();

Technical Details

PHP Version:	4+

❮ PHP Output Control Functions