PHP Error Start configuration

PHP Error Start configuration
PHP error message
Saturday, November 22, 2008 03:16 p.m.
Sets the level of error message return.

Syntax: int error_reporting (int [level]);

return value: Integer

Function type: PHP system functions


E_notice indicates that the general situation is not recorded and is only used if the program has an error condition, such as attempting to access a nonexistent variable, or calling stat () to view files that do not exist.
E_warning are usually displayed, but do not interrupt the execution of the program. This is very effective for debugging. For example: Call Ereg () with a problematic regular representation.
The e_error is usually displayed, and the program execution is interrupted. This mask cannot be traced to a memory configuration or other error.
E_parse parse the error from the syntax.
E_core_error is similar to E_error, but does not include errors caused by PHP core.
E_core_warning similar to e_warning, but does not include PHP core error warnings.
Error reporting for PHP

There are many configuration settings in the php.ini file. You should have your own php.ini file set up and put it in the appropriate directory, as shown in the documentation for installing PHP and Apache 2 on Linux (see Resources). When debugging a PHP application, you should know two configuration variables. The following are the two variables and their default values:

PS: Some of the above values may be incorrect,

Display_errors = Off
error_reporting = E_all



By searching for them in the php.ini file, you can find the current default values for both variables. The purpose of the display_errors variable is obvious-it tells PHP if it shows an error. The default value is OFF. However, to make the development process easier, please set this value to on:



Display_errors = On



The default value for the error_reporting variable is e_all. This setting shows all the information from bad coding practices to harmless prompts to errors. E_all is a bit too thin for the development process because it shows hints on the screen for small things (such as uninitialized variables), which can mess up the browser's output. I just want to see errors and bad coding practices, but don't want to see harmless hints. Therefore, replace the default value of error_reporting with the following values:



error_reporting = E_all & ~e_notice



Restart Apache and it's all set up. Next, you'll learn how to do the same thing on Apache.

Error reporting on the server

Depending on what Apache is doing, opening an error report in PHP may not work because there may be multiple versions of PHP on your computer. It is sometimes difficult to tell which PHP version Apache is using because Apache can only view one php.ini file. It is a security issue to not know which php.ini file Apache is using to configure itself. However, there is a way to configure PHP variables in Apache to ensure that the correct level of error is set.

Also, it is best to know how to set these configuration variables on the server side to veto or preempt php.ini files, providing a higher level of security.
When you configure Apache, you should have been exposed to the basic configuration in the http.conf file in/conf/httpd.conf.

To do what has already been done in the php.ini file, add the following lines to httpd.conf, overwriting any php.ini files:


Php_flag display_errors on
Php_value error_reporting 2039



This overrides the flags already set for display_errors in the php.ini file, as well as the value of error_reporting. A value of 2039 represents E_all & ~e_notice. If you prefer to use E_all, set the value to 2047. Again, you'll restart Apache.

Next, you will test the error report on the server.


Source: http://hi.baidu.com/chinamartin/blog/item/cb138c1a2aa1cefdae5133d8.html

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