What is the deprecated feature in PHP that is being discussed in the forum thread?

The deprecated feature in PHP being discussed in the forum thread is the use of the "mysql_" functions for database connections and queries. These functions have been deprecated since PHP 5.5 and have been removed in PHP 7. Instead, developers are encouraged to use the improved MySQLi or PDO extensions for database operations in PHP. 

// Deprecated way using mysql_ functions
$conn = mysql_connect('localhost', 'username', 'password');
mysql_select_db('database_name', $conn);
$result = mysql_query('SELECT * FROM table_name', $conn);

// Updated way using MySQLi
$conn = mysqli_connect('localhost', 'username', 'password', 'database_name');
$result = mysqli_query($conn, 'SELECT * FROM table_name');

// Updated way using PDO
$dsn = 'mysql:host=localhost;dbname=database_name';
$username = 'username';
$password = 'password';
$conn = new PDO($dsn, $username, $password);
$stmt = $conn->query('SELECT * FROM table_name');

Keywords

deprecated feature PHP forum thread functions libraries

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