Why Doesn't mysql_connect() Work in My PHP Code?

Error: "Undefined Function mysql_connect()" in PHP

Introduction:
When attempting to establish a database connection using the mysql_connect() function, you may encounter the error "Call to undefined function mysql_connect()". This error indicates that the function is not recognized by PHP.

Issue:
The error typically arises when PHP is missing the necessary MySQL extension. Despite installing php5-mysql, the issue persists.

Resolution:

For PHP7 and Above:
In PHP7, the mysql_* functions have been removed due to deprecation. To resolve the error, you should update your code to use either PDO or MySQLi functions instead.

For PHP5:
Workaround:
If it's not feasible to update your code, you can utilize a workaround by creating an include file, fix_mysql.inc.php. This file recreates the old mysql_ functions with the mysqli_ functions. By including this file before using mysql_ functions, it will translate them to their mysqli_ equivalents. Here's an example of the workaround:

<?php // Include the fix_mysql.inc.php file
include 'fix_mysql.inc.php';

// Use the mysql_* functions as usual
$conn = mysql_connect('hostname', 'username', 'password');

?>

Please note that this workaround is a temporary measure and it's still recommended to migrate your code to use PDO or MySQLi functions in the long run.

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