Predefined Constants
Output Control Functions
Output Control
PHP Manual

# Examples

Example#1 Output Control example

`<?php
ob_start();
echo "Hello\n";
setcookie("cookiename", "cookiedata");
ob_end_flush();
?>`

In the above example, the output from echo() would be stored in the output buffer until ob_end_flush() was called. In the mean time, the call to setcookie() successfully stored a cookie without causing an error. (You can not normally send headers to the browser after data has already been sent.)

Predefined Constants
Output Control Functions
Output Control
PHP Manual