How can PHP developers improve code efficiency and security by transitioning from mysql_* functions to PDO or mysqli?

Using mysqli or PDO instead of mysql_* functions can improve code efficiency and security by providing prepared statements to prevent SQL injection attacks and better error handling capabilities. To transition from mysql_* functions to PDO or mysqli, developers should update their database connection and query functions to use the new libraries. 

// Example of transitioning from mysql_* functions to mysqli

// Old mysql connection
$conn = mysql_connect($servername, $username, $password);
mysql_select_db($dbname);

// New mysqli connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Old mysql query
$result = mysql_query("SELECT * FROM users");

// New mysqli query with prepared statement
$stmt = $conn->prepare("SELECT * FROM users");
$stmt->execute();
$result = $stmt->get_result();

Keywords

PHP mysql_ functions PDO mysqli security

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