How can debugging techniques, such as using mysqli or PDO instead of mysql, be implemented to troubleshoot and fix issues in PHP code?

Issue: Using the mysql extension in PHP is deprecated and no longer supported. To fix this issue and prevent potential security vulnerabilities, it is recommended to use either the mysqli extension or PDO for interacting with databases in PHP. Code snippet using mysqli: 

// Create a connection to the database using mysqli
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

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

// Perform a query using mysqli
$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();

Keywords

debugging mysqli PDO mysql PHP code

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