Why is my PHP code throwing a 'Call to undefined function mysql_connect()' error?

Unraveling "Call to undefined function mysql_connect()":

While attempting to establish a connection to a MySQL database, you may encounter the dreaded "Call to undefined function mysql_connect()" error. This issue arises when your PHP script attempts to utilize the mysql_* functions, such as mysql_connect(), which have been deprecated in PHP 7.

Root of the Problem:

PHP 7 marked a significant shift by removing the mysql_* functions due to concerns about their security and performance limitations. As a result, these functions are no longer available and cannot be executed.

Solution Pathways:

To overcome this hurdle, you must adopt one of the following alternatives:

• MySQLi (MySQL Improved Extension): An extension that provides a more object-oriented approach for database connectivity and offers enhanced security and stability.
• PDO (PHP Data Objects): A more universal interface for database abstraction, providing support for multiple database systems, including MySQL.

Implementation Example:

To establish a MySQL connection using MySQLi, you can utilize the following code:

$mysqli = new mysqli("$mysql_hostname", "$mysql_username", "$mysql_password", "$mysql_database");

Similarly, for PDO connectivity, you can employ the following syntax:

$pdo = new PDO("mysql:host=$mysql_hostname;dbname=$mysql_database", $mysql_username, $mysql_password);

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