What are the potential issues with using the mysql extension in PHP for database connectivity and querying?

The mysql extension in PHP is deprecated and has been removed in PHP 7. It is recommended to use mysqli or PDO extensions for database connectivity and querying to ensure compatibility with newer PHP versions and better security features. 

// Using mysqli extension for database connectivity
$mysqli = new mysqli('localhost', 'username', 'password', 'database_name');
if ($mysqli->connect_error) {
    die('Connection failed: ' . $mysqli->connect_error);
}

// Using PDO extension for database connectivity
$pdo = new PDO('mysql:host=localhost;dbname=database_name', 'username', 'password');
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

Keywords

mysql extension PHP database connectivity querying potential issues

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