Question

I have a contact form in my website. I need users to send messages to my email, and it does so. I also have a checkbox, which when checked, the users will have the message to the email indicated on the email textbox. My code sends it only to my email, but it doesn’t send a copy when the checkbox is checked.

Contact.html

<input type="checkbox" name="sendcopy" value="Yes" checked/>Copy this message to your mail

Sendmail.php:

$messagebody="Name: ".$name."".PHP_EOL;
$messagebody.="email: ".$email."".PHP_EOL;
$messagebody.="website: ".$website."".PHP_EOL;
$messagebody.="message: ".nl2br($message)."".PHP_EOL;

mail($to,$subject,$messagebody,$headers)or die("The message failed to send");  

if(isset($_POST["sendcopy"]) && $_POST["sendcopy"]=="checked"){
mail($email,$subject,$messagebody,$headers)or die("The message failed to send a copy") 
    }

Answer 1

In the snippet if(isset($_POST["sendcopy"]) && $_POST["sendcopy"]=="checked"){ value of $_POST["sendcopy"] you are trying to match with is wrong.
Instead, you can use just if(isset($_POST["sendcopy"]){ to check if that checkbox is checked.