local value表示当前目录的设置，网上查是
"Master Value" (from php.ini) could be overridden with "Local Value" in httpd.conf, .htaccess or other Apache configuration with php_value directive.
master value是php.ini的设置，起作用的是master value
php.ini 中local value和 master value
原文：http://www.cnblogs.com/you-jia/p/4835440.html