PHP write file from choose from multiply to txt - php

Question

sorry but i didn't learn PHP yet so can any one help me . i want the out put of the form written in txt file and a messege like " thank you " be the answer if the visitor complete the form and press submit
<form role="form" method="post" id="contact-form">
<input type="text" placeholder="Name" name="Name" id="Name" required>
<input type="email" placeholder="Email" name="Email" id="Email" required>
<input type="text" placeholder="Phone" name="Phone" id="Phone">
<select name="test">
<option selected disabled="disabled"> Where do you live?</option>
<option value="test12"> Al Amirat</option>
<option value="test13"> Other</option>
</select>
<br>
<button type="submit" id="submit"> Submit</button>
<div id="success"></div>
</form>
the last PHP code was to make it to email
<?php
$name = $_POST['Name'];
$email = $_POST['Email'];
$phone = $_POST['Phone'];
$subject = $_POST['Subject'];
$message = $_POST['Message'];
$to = 'test#email.com';
$subject = 'the subject';
$message = 'FROM: '.$name.' Email: '.$email.' Phone: '.$phone.' Subject: '.$subject.' Message: '.$message;
$headers = 'From: youremail#domain.com' . "\r\n";
if (filter_var($email, FILTER_VALIDATE_EMAIL)) { // this line checks that we have a valid email address
mail($to, $subject, $message, $headers); //This method sends the mail.
echo "Your email was sent!"; // success message
}else{
echo "Invalid Email!";
}
?>
but after the client need to add the choose from place and making it in txt not email i didn't know how it solved

Answer 1

Here is one example,
$file = 'people.txt';
// Open the file to get existing content
$current = file_get_contents($file);
// Append a new person to the file
$current .= "John Smith\n";
// Write the contents back to the file
file_put_contents($file, $current);
Check more the example Here,
There are few things you might get stuck with.
Folder Permission:
PHP must have write permission to the folder you are going to save the file. Which 777 permission. So be very careful about security.
Path Separator
Path separators are different for linux and windows. So choose accordingly.