这些函数的行为受 php.ini 中的设置影响。
INI_SYSTEM
这是配置指令的简短说明。
yaconf.check_delay
In which interval Yaconf will detect ini file's change(by directory's mtime), if it is set to zero, you have to restart php to reloading configurations.
yaconf.directory
Path to directory which all INI configuration files are placed in.