thinkphp how to debug errors

1. Turn on debugging mode

When developing with ThinkPHP, it is very important to turn on debugging mode. It is recommended to turn on the debug mode of the application when encountering problems during development so that problems can be discovered more easily.

Enabling debugging mode is also very simple. You only need to set app_debug to true in the application's config.php file.

2. Check the error message

When an error occurs, ThinkPHP will automatically output the error message. You can check the error message to determine the exact location of the problem so you can fix it.

During the development process, if the page does not respond or the output is blank, you need to check the error message. Under normal circumstances, the error message will be displayed at the bottom of the page, and the log can also be viewed in the log folder under the runtime directory of the application.

3. Common errors and solutions

1. Cannot find controller or method

When the controller or method you access does not exist, a 404 error will appear on the page. At this time, you should verify the correctness of the URL address and ensure that the controller and method exist.

2. Database connection error

When a database connection error occurs, it is usually caused by database configuration or database access permission issues. You can check whether the database configuration is correct and whether the database connection is normal. Can be configured in the db.php file.

3. Grammar errors

Grammar errors refer to grammatical problems in the code, such as spelling errors or incorrect use of symbols. This error can be identified and corrected by modifying the code according to the prompt information.

4. Template error

Template error refers to problems such as syntax errors and undefined variables in the template file. These errors can be output directly on the page, and the problem can be determined through prompt information.

4. Use Xdebug for debugging

In addition to the above methods, you can also use Xdebug for debugging. Xdebug is a PHP debugger that can help us find problems in the code. Before using Xdebug for debugging, you need to configure the following:

1. Install the Xdebug extension,

2. Configure the PHP.ini file, and enable Xdebug

3. Install an editor that supports this extension

When using Xdebug for debugging, you can directly open the file in the editor, set breakpoints, and Access the URL address in your browser. Once the program reaches that breakpoint, the editor automatically pauses, allowing you to view variable status, inspect the stack, perform single-step operations, and more.

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