What are the best practices for debugging PHP scripts that involve form submissions and database interactions?

When debugging PHP scripts that involve form submissions and database interactions, it is essential to check for errors in the form data being submitted, validate the data before inserting it into the database, and use error handling to catch any database-related issues. Additionally, using tools like var_dump() or print_r() can help inspect variables and identify any potential problems. 

// Example of debugging PHP script involving form submissions and database interactions

// Check for form submission
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    
    // Validate form data
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    if (empty($name) || empty($email)) {
        echo "Name and email are required";
    } else {
        // Database connection and insertion
        $conn = new mysqli("localhost", "username", "password", "database");
        
        if ($conn->connect_error) {
            die("Connection failed: " . $conn->connect_error);
        }
        
        $sql = "INSERT INTO users (name, email) VALUES ('$name', '$email')";
        
        if ($conn->query($sql) === TRUE) {
            echo "New record created successfully";
        } else {
            echo "Error: " . $sql . "<br>" . $conn->error;
        }
        
        $conn->close();
    }
}

Keywords

Xdebug var_dump SQL injection PDO error handling

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