ini_set
Description
string ini_set ( string varname, string newvalue )Sets the value of the given configuration option. Returns the old value on success, FALSE on failure. The configuration option will keep this new value during the script's execution, and will be restored at the script's ending.
Not all the available options can be changed using ini_set(). There is a list of all available options in the appendix.
See also: get_cfg_var(), ini_get(), ini_get_all(), ini_restore() 和 How to change configuration settings