Why is `mysql_connect()` Deprecated in PHP 7 and How Do I Fix It?

Undefined Function 'mysql_connect()' in PHP

You've configured PHP, MySQL, and Apache, and localhost() functions correctly in PHP. However, after installing MySQL, you encounter the error:

Fatal error: Call to undefined function mysql_connect()

This issue arises because you have upgraded to PHP 7, where the mysql_connect function is deprecated. To resolve it:

1. Check your PHP version with php -version.
2. Replace mysql_connect with mysqli_connect in your code:

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

If you're migrating legacy PHP code, you'll need to convert all your mysql_* functions to mysqli_* equivalents.

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