Why Does My PHP Code Throw a \'Fatal Error: Call to Undefined Function mysql_connect()\' After MySQL Installation?

Resolving "Fatal Error: Call to Undefined Function mysql_connect()" Post-MySQL Installation

Encountering the "Fatal error: Call to undefined function mysql_connect()" message after installing MySQL may indicate a potential issue. Let's examine the solution.

Understanding the Issue

The mysql_connect() function is used to establish a connection to a MySQL database. However, with the introduction of PHP 7, this function has been deprecated in favor of mysqli_connect(). If you have recently upgraded to PHP 7 and still rely on mysql_connect(), you will encounter this error.

Solution: Migrating to mysqli_connect()

To resolve this issue, you must transition your code to use mysqli_connect() instead of mysql_connect(). The updated code would look like this:

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

Upgrading Legacy PHP Code

If your codebase contains multiple occurrences of mysql_ functions, you may need to systematically replace them with their mysqli_ counterparts to ensure compatibility with PHP 7.

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