Why Am I Getting \'Undefined Function mysql_connect()\' Error in PHP?

Troubleshooting "Undefined Function mysql_connect()"

Running into the "Undefined function mysql_connect()" error while attempting to utilize MySQL? Here's a comprehensive guide to resolving this issue.

Analysis

Despite installing the PHP MySQL extension, you continue to encounter this error. The error occurs because the mysql_* functions used to interact with MySQL have been deprecated in PHP versions 5.5 onwards and fully removed in PHP7.

Solution

To address this issue, you have two options:

1. Migrate to PDO or mysqli Extensions:

It is recommended to update your code to use the PDO or mysqli extensions for database interaction. They provide more secure and feature-rich alternatives to the deprecated mysql_* functions.

2. Workaround using fix_mysql.inc.php:

If migrating to modern extensions is not feasible, you can use the "fix_mysql.inc.php" workaround. This PHP file redefines the mysql_* functions using their mysqli counterparts.

Implementation

To implement the workaround, follow these steps:

1. Download the "fix_mysql.inc.php" file from the provided link in the question's answer.
2. Copy the file to the directory where your PHP code is located.
3. Include the file within your scripts using include_once 'fix_mysql.inc.php'.

This workaround allows you to continue using the mysql_* functions in PHP7 environments. However, it is strongly advised to migrate your code to the recommended extensions for long-term stability and enhanced security.

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