Solution to PHP Fatal error: Uncaught Error: Call to undefined function mysql_pconnect()

PHP is a widely used open source scripting language used for web application development. However, when using PHP, you may encounter many errors. One of the common errors is "PHP Fatal error: Uncaught Error: Call to undefined function mysql_pconnect()".

This error usually occurs when trying to use old versions of PHP code or outdated MySQL API, because in the latest version of PHP, the mysql_pconnect() function has been deprecated. This error will cause the web application to not work properly, so it needs to be resolved promptly.

So, how to solve this problem? Here are some solutions:

1. Switch to using the mysqli function: mysqli is a MySQL extension provided by PHP and can replace the mysql function. So if you are using old PHP code or MySQL API, try using mysqli functions.
2. Upgrade to the latest version of PHP: PHP 5.5 version has removed the mysql extension, so it is recommended to upgrade to the latest version of PHP. This avoids problems with using mysql_pconnect() and results in better performance and security.
3. Install MySQLi or PDO extension: MySQLi and PDO extension are two optional extensions provided by PHP that can interact with MySQL database. They provide better performance and security, and support MySQLi and PDO objects, allowing you to access MySQL databases using an object-oriented approach.
4. Check the PHP.ini configuration file: In some cases, it may be necessary to check the php.ini configuration file to ensure that the mysql extension is loaded correctly. You can determine whether the mysql extension is loaded correctly by looking at the configuration information in the output of the phpinfo() function.
5. Repair or update MySQL server: In some cases, it may be found that errors are caused by a MySQL server failure or security vulnerability. Therefore, trying to repair or update the MySQL server may solve the problem.

In short, when the "PHP Fatal error: Uncaught Error: Call to undefined function mysql_pconnect()" error occurs, you can try the above solutions to solve the problem. It is important to remember to avoid using the deprecated MySQL API, use the latest versions of PHP and MySQL extensions, and perform regular maintenance on your server and applications.

The above is the detailed content of Solution to PHP Fatal error: Uncaught Error: Call to undefined function mysql_pconnect(). For more information, please follow other related articles on the PHP Chinese website!