Wordpress: add input box values in mailto body text - html

Question

I am trying to create a simple form which collects four items of info to send via the users own email to a supplier to request permission for 3rd party access to some of their data.
screen shot
Your Name:
Farm Supply Number 1:
Farm Supply Number 2:
Farm Supply Number 3:
Email your supplier here
Could you please advise how I can insert the text
Many thanks

Answer 1

Taking if from here: I am looking to collect data from input boxes and then use this text in the body of the email. Thank you. I wrote the following for you:
<?php
if(isset($_POST['submit'])) {
$name = $_POST['name'];
$supplier1 = $_POST['supplier1'];
$supplier2 = $_POST['supplier2'];
$supplier3 = $_POST['supplier3'];
$to = "your_email#gmail.com"; // example, fill in your own
$subject = "Mail sent from the form on the website by ".$name;
$message = $name." has sent in the following suppliers:\r\nSupplier 1: ".$supplier1."\r\nSupplier 2: ".$supplier2."\r\nSupplier 3:".$supplier3;
mail($to, $subject, $message);
echo "E-mail has been sent."
}
?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<label for="name">Your name : </label><input type="text" name="name" required><br>
<label for="supplier1">Farm supply number 1 : </label><input type="number" name="supplier1" required><br>
<label for="supplier2">Farm supply number 2 : </label><input type="number" name="supplier2" required><br>
<label for="supplier3">Farm supply number 3 : </label><input type="number" name="supplier3" required><br>
<input type="submit" name="submit" value="Click here to send e-mail"
</form>
If anything doesn't work, let me know, I didn't test this.
If you want to add security then use things like the htmlentities() function.
You will get things like
<form method="post" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>">
and
$supplier1 = htmlentities($_POST['supplier1']);
You could also add some extra security on checking if the fields are actually filled in before sending, I used required on the html, but this is no guarantee. I would also suggest you let people fill in any information so that you can contact them, like e-mail or phone.
Have more information here:
Using PHP_SELF
PHP Mail function
HTML Form