iis output php error

IIS output PHP error

With the continuous development of the Internet, there are more and more websites based on the PHP language, and IIS is a commonly used Web server platform. When using IIS to run PHP programs, you will inevitably encounter some PHP error problems. In order to troubleshoot these issues, you need to understand how IIS outputs PHP errors.

1. Default Settings for IIS

IIS does not display PHP errors by default due to security considerations. If the error message in the PHP script is output directly, important information on the server may be leaked, leaving a loophole for hacker attacks. Therefore, IIS by default logs PHP error messages in the Windows event log, which is accessible only to administrators.

If you want to see PHP error messages directly in IIS, you need to modify the settings of PHP and IIS.

2. Modify PHP settings

Open the PHP.ini file and find the following two lines:

display_errors = Off
log_errors = On

Change the value of display_errors Change to On. In this way, the error information in the PHP script will be output directly to the browser for easy viewing. At the same time, if you want to log error information, you can change the value of log_errors to On.

After the modification is completed, you need to restart the IIS server to take effect.

3. Modify IIS settings

Open IIS Manager, find your website, double-click "Error Page", and then click "Edit Property Settings".

In the "Edit Properties" dialog box on the "Edit Property Settings" page, find the option "Send detailed error messages to the client" and set it to "true".

In addition, for IIS7 and above, the fastcgi module also needs to be set.

Open IIS Manager, right-click under "Server Node", select the "Module" option, set the "Details of Failed Request Tracking" of the fastcgi module to "Detailed", and then restart the IIS server.

4. Common PHP errors

PHP error messages usually include two parts, namely error type and error message.

Common PHP error types include:

• Fatal Error, a fatal error that will cause the program to terminate;
• Syntax Error, a syntax error, usually a spelling error Or the quotation marks are not paired, etc.;
• Warning, warning information, usually indicates that the program may have problems;
• Notice, prompt information, usually some unimportant information.

Common PHP error messages include:

• Undefined variable, undefined variable;
• Call to undefined function, call undefined function;
• Division by zero, the divisor is 0;
• Cannot modify header information, the header information cannot be modified;
• Failed opening required, the required file cannot be opened.

5. Summary

The default settings of IIS will not directly output PHP error messages, and you need to make some settings yourself. When modifying the settings of PHP, you need to set display_errors to On and log_errors to On to easily view PHP error message. When modifying the settings of IIS, you need to set the "Send detailed error message to client" option to "true" and set the verbosity of the fastcgi module. Finally, you need to understand common PHP error types and messages to better troubleshoot and fix them.

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