- function_exists: documentation ( source)
- register_shutdown_function: documentation ( source)
- sleep: documentation ( source)
<?php echo "and ..."; if (function_exists('register_postsend_function')) { register_postsend_function(function() { echo "... you should not be seeing this"; sleep("10"); }); } else register_shutdown_function(function() { echo "... you should not be seeing this"; sleep("10"); }); die();