Why Does PHP Throw a \'Fatal error: Call to undefined function mysql_connect()\' Error, and How Can I Fix It?

PHP Error: Undefined Function "mysql_connect()"

Having set up PHP, MySQL, and Apache, a common PHP error message that users encounter is "Fatal error: Call to undefined function mysql_connect()". This error typically occurs when you attempt to use the "mysql_connect()" function, which is a deprecated function in PHP 7 and later versions.

To resolve this issue, determine your PHP version by running the following command:

php -version

If the result indicates PHP 7 or above, you need to migrate from "mysql_" functions to their updated counterparts, "mysqli_" functions. Here's an example of how to update your code:

$host = "127.0.0.1";
$username = "root";
$pass = "foobar";
$con = mysqli_connect($host, $username, $pass, "your_database");

This change will allow you to use the "mysqli_connect()" function and establish a connection to your MySQL database. Remember to update all your "mysql_" functions with their "mysqli_" counterparts when upgrading from legacy PHP versions.

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