Abouts
From a common user point of view, there are two types of proxies PHP proxy and CGI proxy. PHP proxies use PHP scripts to power the server while CGI proxy depends upon CGI scripts to make things work for netizens.
If to juxtapose both, PHP proxy is a cleaner script and it does not consume too much server resources. However, it must be kept in mind that PHP proxies do not support myspace.com. In other words, PHP online proxy is not a MySpace proxy.
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So, if your purpose of surfing includes accessing myspace.com, better opt for CGI powered proxies. CGI proxy is a bit more complex than PHP as CGI scripting by itself is a tad complicated. But, in terms of functional efficiency, it is very much at par with PHP online proxy. CGI proxies are called school proxy sometimes since it is mostly used in schools by children and in workplaces to dupe network filters.
For netizens, however, in order to use an online proxy to anonymously surf the web, he/she does not have to know anything about the technicalities of any scripting languages. It is just about realizing which all websites can be viewed using each type of proxies and selecting an online proxy accordingly. You could find a number of online proxies both PHP and CGI in the web.