Input and output values for php into the browser?



PHP Snippet 1:

<!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 method="get" action="<?php $_SERVER['PHP_SELF']; ?>">
            <input type="text" value="" id="textField" name="number">
            <input type="submit" value="Enter" class="button" name="submit">
        </form>


        <?php


        if (isset($_GET['submit']))
            $number = isset($_GET['number']) ? $_GET['number'] : '';

        if ($number == 1) {
            $returntext =  "The day of the week is Monday";
        } else if ($number == 2) {
            $returntext =  "The day of the week is Tuesday";
        } else if ($number == 3) {
            $returntext =  "The day of the week is Wednesday";
        } else if ($number == 4) {
            $returntext =  "The day of the week is Thursday";
        } else if ($number == 5) {
            $returntext =  "The day of the week is Friday";
        } else if ($number == 6) {
            $returntext =  "The day of the week is Saturday";
        } else if ($number == 7) {
            $returntext =  "The day of the week is Sunday";
        } else {
            $returntext =  ("Wrong input, try again!");
        }

        ?>

        <div id="valueReturned">
            <p id="returnText"><?php echo $returntext; ?><p>
        </div>
        <a href="index4.html" id="jButton">
            <h3> Next Exercise </h3>
        </a>

    </div></section>

PHP Snippet 2:

<?php
$response = "";
if(isset($_POST) && isset($_POST["mytext"])): /// check if user submitted form

$num = $_POST["mytext"];  //put form mytext variable.. retrieved from html <input name="mytext".... 


    if(is_numeric($num)):

switch($num):

        case "1":
            $response = "Monday";
        break;
        case "2":
            $response = "Tuesday";
        break;
        case "3":
            $response = "Wednesday";
        break;
        case "4":
            $response = "Thursday";
        break;
        case "5":
            $response = "Friday";
        break;
        case "6":
            $response = "Saturday";
        break;
        case "7":
            $response = "Sunday";
        break;
        default:
            $response = "Invalid number";

endswitch;

    else:

    $response = "Invalid number";

    endif;


endif;


?>

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>PhpFiddle Initial Code</title>

<!--     
    http://phpfiddle.org
-->

<script type="text/javascript">
    
</script>

<style type="text/css">
    
</style>
</head>

<body>
<div style="margin: 30px 10%;">
<h3>My form</h3>
<form id="myform" name="myform" action="" method="post">

    <label>Text</label> <input type="text" value="" size="30" maxlength="100" name="mytext" id="" /><br /><br />
   
    <br />
   
    <button id="mysubmit" type="submit">Submit</button><br /><br />
    <?php if (isset($_POST)): ?>
    <div style="background-color:red;color:white;"><?php echo $response; ?></div>
    <?php endif; ?>
    </div>

</form>
</div>

<?php

?>

</body>
</html>