If the server side data is empty, PHP may encounter some error

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That's probably it, if the landlord still doesn't understand, you can go to the backing person to learn.

Database connection error: If a PHP application needs to retrieve data from the database, but is unable to connect to the database, it may result in empty server-side data.

SQL query errors: If the SQL query has syntax errors or logical errors, the required data cannot be retrieved, resulting in empty data on the server.

File path error: If the PHP application needs to retrieve data from a file, but the file path is not set correctly, it may result in the data not being read, resulting in empty server-side data.

Logical errors: If a PHP application has a logical error while processing a request, such as not initializing a variable correctly or a logical error causing the data to not be loaded correctly, it can result in empty server-side data.

Server configuration issues: If the server is incorrectly configured, such as PHP configuration error or insufficient permissions, PHP may not work properly, resulting in empty server data.

In order to find the reason why the server data is empty, you can add debugging information and use logging in php** to help troubleshoot the problem. If the problem cannot be resolved with debugging and logging, you may need to consult a professional PHP developer or server administrator to resolve the issue.

This problem is more troublesome, submitting data to the server can also be said to submit data to the database, so it doesn't matter if you say PHP, the main thing is to write data to the server database. On the premise of the server and the MySQL service, you can access the database through GPRS link to the database, and so on. There are too many cpc16, you can define it yourself!

There are a lot of things about CRC16 on the Internet.

I'm using Arduino, and the online tutorials don't write how to get the web side.,I don't know.,The landlord solves it.,Trouble to inform.。

Did the landlord solve it? I'm also experiencing this issue.

Echo step by step,Or comment to judge,Let's see if there is a problem with the PHP program.,Which line is the problem.。

You mean to say that the addition of this line is the problem?

Check the path, or related permissions, and then search for the 500 errors that people encounter.

There is no environment and no measurement, I went to your link and read it, and it prompted a 500 error.

Actually, I randomly typed in the password account, and I jumped to judge, but the 500 error was prompted.

Take a look at the background settings, find the space customer service, and make the error prompt more detailed.

It's not a mysql server! If yes! I'll write to you:

conn=mysql_connect($host,$user,$pwd);

mysql_select_db('root');

Enter http: domain install

If the installation page appears dir and the installation interface does not appear, delete the install folder, and then see if there are install and these 2 files in the install folder, if there is an install file, change the name to change.

If it's native, you try your IP connection, mainly to see if your password is correct.

The 500 error is that the script is running incorrectly, you can see how many lines of the program are wrong when you look at your logs, it is better to set the web server to display the error message to the browser.

It's the same with servers. You can modify it if you have administrator privileges.

Friend, are you sure you have curl installed on your linux? If you don't have it, you can't use it.

Use curl error to see what information is returned.

Under Windows, you need to check whether it is loaded and whether there is a configuration of MySQL in phpinfo.

It is possible that the server is not set up What operating system do you, what HTTP server, if you are a manual environment under Windows, check it carefully, if it is only with mysql functions will error, check whether the system variables have been added to the mysql bin directory, check whether mysql is running normally, check whether php has loaded mysql extensions.

For beginners, it is recommended to use the integrated ampserv to set up the environment.

If this error is reported as 500, it is a server-side problem!