php错误显示

为啥要整理下php的报错机制？

一门语言懂了报错机制，就能够处理复杂的异常或错误代码了。提升功力

 

设置php错误显示等级

ini_set('display_errors', 1);
#

 

 

实力调试出错误

Warning 

警告

Warning: Invalid argument supplied for foreach() in /data/www/sf-plearnu-local/web/3.php on line 9

ini_set('display_errors', 1);

foreach(1 as $v); 程序编译后。执行出错，报警告错误

 

Parse

解析

 

Parse error: syntax error, unexpected end of file in /data/www/sf-plearnu-local/web/3.php on line 10

ini_set('display_errors', 1);

foreach(1 as $v)

// 少了标点符号，在解析代码的时候就错误了

 

Notice

通知

 

Notice: Undefined variable: ads in /data/www/sf-plearnu-local/web/3.php on line 9

ini_set('display_errors', 1);

echo $ads;

// 变量未定义，通知错误

 

Fatal

致命

 

它话

include 包含的文件不存在的时候，程序报警告错误。代码继续执行

require 包含的文件不存在的时候，程序报致命错误，代码不向下执行

require('321.php');
echo '---';

Warning: require(321.php): failed to open stream: No such file or directory in /data/www/sf-plearnu-local/web/1.php on line 10

Fatal error: require(): Failed opening required '321.php' (include_path='.:/usr/share/pear:/usr/share/php') in /data/www/sf-plearnu-local/web/1.php on line 10

include('321.php');
echo '---';

Warning: include(321.php): failed to open stream: No such file or directory in /data/www/sf-plearnu-local/web/1.php on line 10

Warning: include(): Failed opening '321.php' for inclusion (include_path='.:/usr/share/pear:/usr/share/php') in /data/www/sf-plearnu-local/web/1.php on line 10
---