$_POST array not populated by form submission - php

Question

I am working on an email subscribe feature on my website. I encountered an issue where the php is not getting the form values. I have looked at numerous threads on this issue and have not had any luck.
So, how can I get the value of the email field in php?
<div>
<form action="/email.php">
<label for="fname">First Name</label>
<input type="text" id="fname" name="firstname" placeholder="Your name..">
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lastname" placeholder="Your last name..">
<label for="email">Email</label>
<input type="text" id="email" name="email">
<input type="submit" value="Submit">
</form>
</div>
Email.php
<?php
$email = $_POST["email"];
echo $email;
?>

Answer 1

don't use / before email.php and you forgot method type
<div>
<form action="email.php" method='POST'>
<label for="fname">First Name</label>
<input type="text" id="fname" name="firstname" placeholder="Your name..">
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lastname" placeholder="Your last name..">
<label for="email">Email</label>
<input type="text" id="email" name="email">
<input type="submit" value="Submit">
</form>
</div>

Answer 2

add form method Attribute get or post
<form action="/email.php" method = "POST">

Answer 3

Try this way,
HTML:
<form action="email.php" method='POST'>
<label for="fname">First Name</label>
<input type="text" id="fname" name="firstname" placeholder="Your name..">
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lastname" placeholder="Your last name..">
<label for="email">Email</label>
<input type="text" id="email" name="email">
<input type="submit" name="save" value="Submit">
</form>
PHP:
<?php
if(isset($_POST["save"]))
{
print_r($_POST);
echo $_POST["email"];
}
?>
This will helpful to you.
Regards

Answer 4

Every thing written perfectly, just fault's in form tag, remove "/" from action and give method="POST" in form tag.
As you are calling that value with post method in email.php, you have to give the post method on form
like this:-
<div>
<form action="email.php" method="POST">
<label for="fname">First Name</label>
<input type="text" id="fname" name="firstname" placeholder="Your name..">
<label for="lname">Last Name</label>
<input type="text" id="lname" name="lastname" placeholder="Your last name..">
<label for="email">Email</label>
<input type="text" id="email" name="email">
<input type="submit" value="Submit">
</form>
</div>
rest is all fine
now you can call that value:-
<?php
$email = $_POST["email"];
echo $email;
?>