PHP错误处理

//越小越严重
echo "
";echo E_ERROR;//1
echo "
";echo E_WARNING;//2
echo "
";echo E_PARSE;//4
echo "
";echo E_NOTICE;//8
echo "
";echo E_CORE_ERROR;//16
echo "
";echo E_CORE_WARNING;//32
echo "
";echo E_COMPILE_ERROR;//64
echo "
";echo E_COMPILE_WARNING;//128
echo "
";echo E_USER_ERROR;//256
echo "
";echo E_USER_WARNING;//512
echo "
";echo E_USER_NOTICE;//1024
echo "
";echo E_STRICT;//2048
echo "
";echo E_ALL;//32767

//简单定义
trigger_error('这是用户自定义的notice',E_USER_NOTICE);
trigger_error('这是用户自定义的Warning',E_USER_WARNING);
trigger_error('这是用户自定义的Warning',E_USER_ERROR);

//函数定义
 function error_info($error_level, $error_msg, $error_file, $error_line)
    {
        echo "错误等级" .$error_level .':';
        echo '错误信息:'.$error_msg.'';
        echo '文件:'.$error_file;
        echo '行号:'.$error_line;
    }
    //将自定义的错误函数,注册到php系统中
    set_error_handler('error_info');