What are the advantages of using a 2-step check for email validation in PHP?

Issue: Email validation in PHP can sometimes be bypassed by users entering fake or invalid email addresses. Implementing a 2-step check for email validation can help ensure the email address provided is valid and belongs to the user. 

// Step 1: Generate a verification code and send it to the user's email address
$verification_code = rand(1000, 9999);
$to = "user@example.com";
$subject = "Email Verification Code";
$message = "Your verification code is: " . $verification_code;
mail($to, $subject, $message);

// Step 2: Ask the user to enter the verification code and compare it with the generated code
if(isset($_POST['verification_code'])) {
    $user_verification_code = $_POST['verification_code'];
    
    if($user_verification_code == $verification_code) {
        echo "Email address verified successfully!";
    } else {
        echo "Invalid verification code. Please try again.";
    }
}

Keywords

email validation 2-step check PHP security verification code

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