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Homephp教程php手册php错误级别的设置方法

PHP在运行时, 针对严重程度不同的错误,会给以不同的提示,这里简单介绍下, 方便需要的朋友

PHP在运行时, 针对严重程度不同的错误,会给以不同的提示。

eg:在$a没声明时,直接相加,值为NULL,相加时当成0来算.但是,却提示NOTICE,即注意.

我们在开发中, 为了程序的规范性,把报错级别,调的比较高NOTICE级别的也报出来,有助于我们快速定位错误和代码规范,香港服务器,网站空间,但是,在产品上线后,网站运营过程中,就不宜报这么多错.

1:这种错误给客户的印象不好
2:在报错时,把网站的绝对路径,如D:\www\1015都报出来了.增大被攻击的风险
因此,在网站上线后,就应该让报错级降低,少报错甚至不报.

修改报错级别:

    1: php.ini里修改error_reporting 选项
    2: 可以在php页面里,用error_reporting()函数来修改

错误级别用2进制的值来表示的: 1111 1111 1111 111从左到右,每位上的1,代表一种错误级别

  fatal error致命错误: 0000 0000 0000 001 开启 1
  warning 警告错误 : 0000 0000 0000 010 开启 2
  NOTICE 警告 : 0000 0000 0001 000 开启 8


eg:

    都报出来: error_reporting(11);
    不要报NOTICE: error_reporting(3);
    任何错误都不报: error_reporting(0);

系统为我们把各个级别的值,用系统常量代替了.

    E_ERROR 1
    E_WARNING 2
    E_NOTICE 8

报所有错误: error_reporting(E_ALL);

除了NOTICE,其他都报: error_reporting(E_ALL & ~E_NOTICE);

  在开发中,报错级别高一点,在上线产品中,报错级别要低:+

复制代码 代码如下:


  define('DEBUG',true); // 在开发时,声明一个DEBUG模式
    if(defined('DEBUG')) { //检测到处于开发模式
    error_reporting(E_ALL);
    } else {
    error_reporting(0);
    }

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