Returns the current value of the PHP configuration
variable specified by
varname, or FALSE
if an error occurs.
It will not return configuration information set when
the PHP was compiled, or read from an Apache configuration
file (using the php3_configuration_option directives).
To check whether the system is using a configuration
file, try retrieving the value of the cfg_file_path
configuration setting. If this is available, a configuration
file is being used.
See also ini_get().