What are the differences between the two PHP code snippets provided in the forum thread?

The issue in the forum thread is that the first PHP code snippet is using the `mysql_` functions which are deprecated and not recommended for use. The second PHP code snippet is using the `mysqli_` functions which are the improved and more secure version. To solve the issue, the first code snippet should be updated to use the `mysqli_` functions instead.

// Original code using mysql_ functions
$link = mysql_connect('localhost', 'user', 'password');
mysql_select_db('database', $link);
$result = mysql_query('SELECT * FROM table', $link);

// Updated code using mysqli_ functions
$link = mysqli_connect('localhost', 'user', 'password', 'database');
$result = mysqli_query($link, 'SELECT * FROM table');