- ob_start: documentation ( source)
- ob_end_flush: documentation ( source)
- register_shutdown_function: documentation ( source)
- header_register_callback: documentation ( source)
<?php
header_register_callback(function () {
echo 'header';
register_shutdown_function(function () {
ob_end_flush();
echo 'shutdown';
});
});
ob_start();
echo ' output ';