How to add 2 variable inputs to txt file save name with php

Question

I want to make the name & date enetered in text boxes as the save name for the .txt file the answers save to if that makes sense. Currently I can get it to use the name variable but not both?

Heres my code:

<?php
$answer1="";
$answer2="";
$answer3="";
$answer4="";
$answer5="";
$answer6="";
$answer7="";
$answer8="";
if(isset($_POST['submit'])){ //if button is clicked do this:
    $name = $_POST['myname'];
    $date = $_POST['date'];
    $answer1 = $_POST['q1answer'];
    $answer2 = $_POST['q2answer'];
    $answer3 = $_POST['q3answer'];
    $answer4 = $_POST['q4answer'];
    $answer5 = $_POST['q5answer'];
    $answer6 = $_POST['q6answer'];
    $answer7 = $_POST['q7answer'];
    $answer8 = $_POST['q8answer'];
    $answersText = "QUESTION 1\r\n\r\n". $answer1. "\r\n\r\nQUESTION 2\r\n\r\n". $answer2. "\r\n\r\nQUESTION 3\r\n\r\n". $answer3. "\r\n\r\nQUESTION 4\r\n\r\n". $answer4. "\r\n\r\nQUESTION 5\r\n\r\n". $answer5. "\r\n\r\nQUESTION 6\r\n\r\n". $answer6. "\r\n\r\nQUESTION 7\r\n\r\n". $answer7. "\r\n\r\nQUESTION 8\r\n\r\n". $answer8. "\r\n\r\n";
    $file = fopen($name ".txt","w");
fwrite($file, $answersText);
fclose($file);

Answer 1

Change

 $file = fopen($name ".txt","w"); 

to

 $file = fopen($name . $date . ".txt","w");

Answer 2

something like this I think you mean?

$file = fopen('Answers/'.$name."_".$date.".txt","w");

Be very careful saving files with filenames based on input from the web, it's input you cannot trust so be sure to thoroughly validate and clean the inputted data.