<?php

// prefetch some data
$bg_result = $con1->query('SELECT ...');

// do some stuff: authenticate user, prepare templates, etc...
output_page_header();

// process the data
while ($row = $bg_result->fetch_assoc())
{
}

output_page_footer();


class mysqli_bg_result extends mysqli_result
{
	public function fetch_assoc()
	{
		while (!$this->ready)
		{
			$this->ready = $this->poll($this->timeout);
		}
		return parent::fetch_assoc();
	}
}