How to Fix \'Fatal Error: Call to Undefined Function mysql_connect()\'?

PHP Error: Unable to Connect to MySQL Database

You have encountered a "Fatal error: Call to undefined function mysql_connect()." This error indicates that PHP is unable to access the MySQL function mysql_connect().

Upon further investigation, you find that you have recently upgraded to PHP 7, which has deprecated the mysql_connect() function in favor of mysqli_connect().

Solution:

To resolve this error, you need to update your PHP code to use the mysqli_connect() function instead of mysql_connect(). Here's an example of how to do this:

<code class="php">$host = "127.0.0.1";
$username = "root";
$pass = "foobar";
$con = mysqli_connect($host, $username, $pass, "your_database");</code>

Additionally, if you are upgrading legacy PHP code, you will need to replace all instances of mysql_* functions with their corresponding mysqli_* counterparts.

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