Below is the php code i have on my website. We get some form submissions that have content in them, but we have also been getting a large amount of empty submissions. When i try to submit a form without filling it. out the site wont allow it. BUT lately a. lot have been coming in looking like this.

“Information Submitted:
Name:
Email:
Phone:
Message:
”
Is this someone trying to hack my site?

I am very new to coding/backend web development and have basically taught myself everything through youtube so i definitely need some help.

<?php

    $userName       = $_POST['name-3'];
    $userPhone      = $_POST['name-2'];
    $userEmail = htmlspecialchars($_POST['email-2']);
    $userMessage    = $_POST['email-3'];

    $to             = "[email protected]";
    $subject        = "Email from my website";
    $body           = "Information Submitted:";

    $body .= "rn Name: " . $userName;
    $body .= "rn Email: " . $userEmail;
    $body .= "rn Phone: " . $userPhone;
    $body .= "rn Message: " . $userMessage;

    mail($to, $subject, $body);///
    
    if (filter_var($userEmail, FILTER_VALIDATE_EMAIL)){
        
     //email is valid
    } else {
        //email is invalid
    }
    
    if ($_POST['submit']) {
        if (mail ($to, $subject, $body, $from)) { 
           $success = "Message successfully sent";
        } else {
            $success = "Message Sending Failed, try again";
        }
    }
?>

My site is hosted on Cpannel through Godaddy. In my web files, there is an error log that tells me “Undefined array key “submit” in /send.php” for each line of the fields below. I feel like this is going to be a super simple fix and I would appreciate the help!

I have tried adding different validations and such but in general I am just confused.