What potential issues can arise when using the mysql_connect and mysql_select_db functions in PHP?

One potential issue that can arise when using the mysql_connect and mysql_select_db functions in PHP is that they are deprecated as of PHP 5.5.0 and removed in PHP 7.0.0. To solve this issue, you should switch to using the mysqli or PDO extension for database connections. 

// Establishing a connection using mysqli extension
$mysqli = new mysqli("localhost", "username", "password", "database_name");

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

Keywords

mysql_connect mysql_select_db PHP database connection error handling

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