suPHP is a tool for executing PHP scripts with the permissions of their owners. It consists of an Apache module (mod_suphp) and a setuid root binary (suphp) that is called by the Apache module to change the uid of the process executing the PHP interpreter.
It provides security, because the PHP scripts are not run with the rights of the webserver’s user. In addition to that you probably won’t have to use PHP’s “safe mode”, which applies many restrictions on the scripts.
suPHP can be used with Apache 1.3 & 2.0 module.
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