Analyze ThinkPHP debugging means and methods

The following thinkphp framework tutorial column will analyze the debugging methods that you should master when using ThinkPHP. I hope it will be helpful to friends in need!

Analysis of debugging methods that should be mastered when using ThinkPHP

Debugging methods that should be mastered when using ThinkPHP

I often see people asking about the return data type of findAll What kind of problems are there, and if something goes wrong and I don’t know why? In fact, I am still not familiar with the debugging methods and methods built into ThinkPHP. Putting aside the debugging methods that come with the IDE itself, if you are using or planning to use ThinkPHP for development If so, then you should understand and master the following debugging-related methods:

1. Turn on the debug mode DEBUG_MODE in the project configuration file, which will allow you to find most of the causes of errors. It may affect the output of verification code.

2. If you don’t want to use debugging mode, you can turn on page Trace display separately. I found that the reason why many people don’t want to use debug mode is actually because of the output of page trace information. In fact, there is a misunderstanding in this, thinking that debug mode must have page trace, but in fact, debug mode and page trace are not necessarily related, just because After turning on debugging mode, the system's default debugging configuration file will enable page Trace display, so you can define a separate debugging configuration file for the project.

3. Use the system-defined dump function. This method can output any type of variable information like var_dump, and is more convenient for viewing in the browser. For example:

The code is as follows:

$User = D("User");
$list = $User->findAll();
dump($list);

4. The page Trace information can only display the sql statements executed on the current page, but cannot view the sql statements in the background operations executed in ajax mode, so you can also enable sql logging SQL_DEBUG_LOG to record each executed sql statement, and you can view the execution time of each sql statement. The sql log file is located under the Logs directory, and the daily sql logs are automatically distinguished by date.

5. Another is if you suspect there is an error in SQL execution after performing a certain data operation, you can use the getLastSql method of the model class to view the last executed SQL statement in order to analyze the specific cause of the error. For example:

The code is as follows:

$User = D("User");
$User->id = 3;
$User->name = 'ThinkPHp';
$User->save();
echo $User->getLastSql();
// 输出 update think_user set where id=3;

6. When you need to debug the running time of a certain piece of code, you can use the debug_start($label) and debug_end($label) methods provided by the system. For example:

The code is as follows:

debug_start('demo');
// 这里是你的代码段.......
debug_end('demo');

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