What are the potential pitfalls of using mysql_connect and mysql_select_db functions in PHP?

The potential pitfalls of using mysql_connect and mysql_select_db functions in PHP are that they are deprecated as of PHP 5.5.0 and removed in PHP 7.0.0. It is recommended to use MySQLi or PDO_MySQL extensions instead for improved security and functionality. 

// Connect to MySQL using MySQLi extension
$mysqli = new mysqli("localhost", "username", "password", "database");

// Check connection
if ($mysqli->connect_error) {
    die("Connection failed: " . $mysqli->connect_error);
}

Keywords

mysql_connect mysql_select_db PHP database connection security vulnerabilities

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