What is the purpose of the PHP function mentioned in the thread?

The purpose of the PHP function mentioned in the thread is to sanitize user input to prevent SQL injection attacks. This function will escape special characters in the input data before using it in a SQL query, ensuring that the query is safe and secure. 

function sanitizeInput($input) {
    $connection = // your database connection
    $sanitized_input = mysqli_real_escape_string($connection, $input);
    return $sanitized_input;
}

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