html form in php not sending to email from server - php

Question

i have a form in my php page like the following:
<form action="" method="post">
<h1>Sign Up Now!
<!-- <span>Sign up and tell us what you think of the site!</span> --></h1>
<div class="inner-wrap">
<label>Your Full Name <input type="text" name="field1" /></label>
<label>Address <textarea name="field2"></textarea></label>
</div>
<div class="button-section">
<input type="submit" value="Submit" name="Sign Up" />
</div>
</form>
the code for it is below:
<?php
if(isset($_POST['submit'])){
$to = "zubairking#gmail.com"; // this is your Email address
$from = $_POST['field1']; // this is the sender's Email address
$first_name = $_POST['first_name'];
$last_name = $_POST['last_name'];
$subject = "Form submission";
$subject2 = "Copy of your form submission";
$message = $first_name . " " . $last_name . " wrote the following:" . "\n\n" . $_POST['message'];
$message2 = "Here is a copy of your message " . $first_name . "\n\n" . $_POST['message'];
$headers = "From:" . $from;
$headers2 = "From:" . $to;
mail($to,$subject,$message,$headers);
mail($from,$subject2,$message2,$headers2); // sends a copy of the message to the sender
echo "Mail Sent. Thank you " . $first_name . ", we will contact you shortly.";
// You can also use header('Location: thank_you.php'); to redirect to another page.
}
?>
my server is also mail enabled, but this code of mine is not sending values to my mail, all the code is in one page, can anyone please tell me whats wrong with my code? thanks in advance

Answer 1

You need the submit button to have name="submit" for the condition if(isset($_POST['submit'])) to be met. You also need to add elements with names='first_name', 'last_name' and 'message' in the form to apply them in your email messages as you are trying to do.
You also need your <input type="text" name="field1" /> to be an email instead a name, given that you are using it to set the sender of the email.