Errors related to "mysql_connect" typically indicate that the script is outdated. Here's an example of the error:
PHP Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /home/user/public_html/script.php:7
This error is caused by the use of the function, "mysql_connect" which was deprecated in PHP 5.5 and removed in PHP version 7.0. For more information, please review the official PHP documentation.
There are two solutions to this issue:
1. (Recommended) The website developer should review all of the PHP files and update the website code to be compatible with supported versions of PHP. Individually, "mysql_connect" should be replaced with "mysqli_connect."
2. (Not recommended) The website's PHP version can be changed via MultiPHP Manager to use an older one that supports mysql_connect such as PHP version 5.4. You may be able to use PHP 5.6, but you may see deprecation warnings.