How can proper debugging techniques help identify errors in PHP database queries and form processing?

Proper debugging techniques involve checking for syntax errors, ensuring the database connection is established correctly, and using error reporting functions like error_log() or var_dump() to identify issues in PHP database queries and form processing. 

// Example of debugging PHP database query
$query = "SELECT * FROM users WHERE id = $user_id";
$result = mysqli_query($conn, $query) or die(mysqli_error($conn));

// Example of debugging PHP form processing
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    if (empty($name) || empty($email)) {
        error_log("Name and email cannot be empty.");
    }
}

Keywords

debugging techniques PHP database queries form processing errors

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