I just started my module on php for school, having completed Javascript two months ago I am familiar with a lot of the elements but a bit rusty. Basically I setup a form with html and added a bit of css to make it pretty. The school is making us do some generic exercices. I now how to grab values etc using this with Javascript

document.getElementById("textBox").value;

and to return the output through my div I created with

document.getElementById("return").innerHTML = ... ;

I honestly can't figure out how to do this with php and I am sure it's real easy but can't for the life of me find a solution online and the schools videos are very vague.

The exerciser is "Create an application that ask the user for number (1-7) and return the day of the week associate with the number entered. You must validate the number"

This is the code I have so far....

```
<!DOCTYPE html>
<html>
<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
    <title>PHP exercise 1</title>
    <link rel="stylesheet" type="text/css" href="./styling1.css"/>
</head>

<body>
    <!--E X C E R S I S E 3 !-->
    <section id="allContent">
        <section>
            <button  class="hide" id="clic">  <h4> E X E R C I C E  1 </h4></button>
        </section>

        <div id="container" class="hidden">
            <div id="Barbox"><p class="pClass"> Create an application that ask the user for number (1-7) and return the day of the week associate with the number entered. You must validate the number</p>
            </div>
            <div id="background"></div>
            <div class="ball"></div><div id="ball2"></div>
            <div id="titleBox">
                <p id="titlePRG">Enter a number!</p>
            </div>

            <form>
                <input type="text" value="<?php echo $number = 1 ; ?>" id="textField">
                <input type="button" value="Enter" class="button" onclick="return_day()">   
            </form>

            <div id="valueReturned">
                <p id="returnText"><p>
            </div>
            <a href="index4.html" id="jButton"><h3> Next Exercise </h3></a>

        </div>
    </section>

    <?php

    function return_day(){

    $number = 1 ;

    if ($number == 1){
        echo "The day of the week is Monday";
    }

    else if ($number == 2){
        echo "The day of the week is Tuesday";
    }

    else if ($number == 3){
        echo "The day of the week is Wednesday";
    }

    else if ($number == 4){
        echo "The day of the week is Thursday";
    }

    else if ($number == 5){
        echo "The day of the week is Friday";
    }

    else if ($number == 6){
        echo "The day of the week is Saturday";
    }

    else if ($number == 7){
        echo "The day of the week is Sunday";
    }

    else{
        echo ("Wrong input, try again!");
    }

}//end of function

    ?>

```

This is what the browser looks like if it makes any difference so you understand my question

[![enter image description here](https://i.stack.imgur.com/Vrsce.png)](https://i.stack.imgur.com/Vrsce.png)

The answer is supposed to display in the white box at the bottom which is