// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings …);包含呈报一些未初始化的变量或捕获变量名的拼写毛病
error_reporting(E_ERROR E_WARNING E_PARSE E_NOTICE);
// Report all errors except E_NOTICE
// This is the default value set in php.ini;呈报一切的毛病但不包含E_NOTICE 这也是php.ini的缺省设置
error_reporting(E_ALL ^ E_NOTICE);
// Report all PHP errors (bitwise 63 may be used in PHP 3);呈报一切的毛病
error_reporting(E_ALL);