getenv Gets the value of an environment variable &reftitle.description; stringgetenv stringvarname Gets the value of an environment variable. You can see a list of all the environmental variables by using phpinfo. Many of these variables are listed within RFC 3875, specifically section 4.1, "Request Meta-Variables". &reftitle.parameters; varname The variable name. &reftitle.returnvalues; Returns the value of the environment variable varname, or &false; on an error. &reftitle.examples; ]]> &reftitle.seealso; putenv apache_getenv Superglobals