What should I do if the php error is not displayed?

In PHP development, we often encounter various errors. Although PHP has a powerful and flexible error handling mechanism, sometimes you may encounter a situation where errors are not displayed on the page. In this case, you lose the ability to quickly find and debug problems. This article will introduce several possible reasons why PHP errors are not displayed and provide solutions.

1. Error level

PHP provides multiple error levels, including error level and warning level. When there are errors in your PHP code, they may be recognized as one of different levels, with Error being the highest level and Warning being the lowest. If there is an error in your PHP code but the error level is set to warning level, then this error will not show up. So make sure your error level is set correctly to error level, for example:

error_reporting(E_ERROR);

This way, when an error occurs in your code, only error level error messages will be displayed.

2. Log Settings

PHP writes error logs to the specified file by default. If there are errors in your PHP code but are not showing up, you may need to check the PHP error log file to find them. The error log can be checked via:

ini_set('display_errors', 0);
ini_set('log_errors', 1);
ini_set('error_log', 'error.log');

These settings will suppress errors from being displayed on the page and write the log to the specified file. Open the specified log file to view errors.

3. PHP Configuration

PHP configuration may cause not shown errors. In the PHP configuration file php.ini, error messages or output may be disabled. For example, if display_errors is set to off, PHP will not display any error messages on the page. You can add the following setting in your code to override this and enable error messages:

ini_set('display_errors', 1);

4. PHP Version

Sometimes, a PHP version can cause a not-shown error. Some PHP versions may make changes to the error handling mechanism or change the default error level. Therefore, make sure that the PHP version you are using is consistent with your PHP code and check if the PHP version supports the error levels used in your code.

Summary

In PHP development, it is very important to find errors in time and solve them in time. If your PHP code is not displaying errors, you can resolve the issue by setting the correct error level, checking the error log, checking the PHP configuration, and ensuring you are using the correct PHP version. The process may require some trial and error, but it will allow you to quickly find and fix bugs in your PHP application, ensuring high reliability and effectiveness of your code.

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