parallel connections with php

i programmed a metasearchengine with php - it works but it is to slow. does someone know how to do parallel connections to searchengines ? Let s say i have 4 php scripts - each script gets data from a searchengine. I have included those 4 script in my resutl html page (via include..) - but i have the feeling that php includes the first script (which connect to searchengine 1) and after it got all data it includes the second script - gets the data and include then scritp 3..::: Does someone know hot to connect those 4 scripts parallel to the searchengines and not seriell? greetings Jens