Why is `mysql_connect()` causing a 'Fatal error' in PHP 7?

Error: "Fatal error: Uncaught Error: Call to undefined function mysql_connect() in register.php:22"

Question:

When attempting to establish a connection with the MySQL server, the following error is encountered:

Fatal error: Uncaught Error: Call to undefined function mysql_connect()

This error occurs specifically in line 22 of the register.php script:

$link = mysql_connect($mysql_hostname , $mysql_username);

Answer:

The mysql_* family of functions, including mysql_connect(), has been deprecated in PHP 7 and subsequently removed entirely. This means that PHP 7 no longer supports these functions.

Since XAMPP utilizes PHP 7, it is likely that you are facing this issue due to PHP 7 being active in your XAMPP installation.

To address this, you have two primary options:

1. MySQLi Extension: The MySQLi extension (MySQL Improved) offers an object-oriented interface to interact with MySQL servers. You can use this extension instead of the mysql_* functions.
2. PDO (PHP Data Objects): PDO provides a consistent and unified interface to interact with different database servers. You can utilize PDO to connect to and manage MySQL databases.

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