Why Am I Getting a 'Call to undefined function mysql_connect()' Error in PHP?

"Undefined function mysql_connect()" Error: Resolving the Issue

When attempting to connect to a MySQL database using the mysql_connect() function, you may encounter the error "Fatal error: Call to undefined function mysql_connect()". This error typically indicates that the necessary PHP extension for MySQL connectivity is not installed or configured properly.

To resolve this issue, verify that you have installed the PHP extension for MySQL. This can be done with a package manager like apt-get:

apt-get install php5-mysql

Once installed, restart your web server (e.g., Apache or Nginx) to apply the changes.

If the problem persists, consider the following:

• Check that the PDO MySQL extension is enabled. Navigate to your PHP configuration file (e.g., php.ini) and ensure that 'extension=pdo_mysql.so' is uncommented.
• If you're using PHP7, the mysql_ functions have been removed. Use PDO or mysqli_ functions instead.
• As a workaround, you can create a PHP include file that redefines the mysql_ functions using mysqli_():

// fix_mysql.inc.php
include_once 'mysqli.inc.php';

function mysql_connect($host = null, $user = null, $password = null)
{
    return mso($host, $user, $password); // Equivalent to 'mysql_connect' in mysqli.inc.php
}

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