What is the purpose of the PHP script provided in the forum thread?

The purpose of the PHP script provided in the forum thread is to sanitize user input data to prevent SQL injection attacks. This is done by escaping special characters that could be used to manipulate a SQL query. By using the PHP function mysqli_real_escape_string, the script ensures that any user input is properly sanitized before being used in a SQL query. 

// Sanitize user input data to prevent SQL injection
$user_input = $_POST['user_input'];
$clean_input = mysqli_real_escape_string($connection, $user_input);

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