I need assistance in making a simple html and php script that lets a user explor...

I need assistance in making a simple html and php script that lets a user explor the RGB color specturum. It should be able to use 6 buttons (R+,G+,B+,R-,G-,B-) that when pressed, add or subtract 2 points (ranging from 0-255) of that color from the RGB ratio. The new RGB color is then displayed in a small window/box at the bottom of the page for the user to see. This should allow the user to explore all the different colors by changing the amount of R(red), G(green), and B(blue) amounts. If theres anything I can do to help please let me know, thank you!

Expert Solution

<?php
session_start();
if (!isset($_GET['action']))
{
    $_SESSION["R"] = 0;
    $_SESSION["G"] = 0;
    $_SESSION["B"] = 244;

}

function checkLimit(int $a)
{
    if ($a >= 0 && $a <= 255)
    {
        return True;
    }
    return False;
}
if (isset($_GET['action']))
{

    if ($_GET['action'] == 'R+')
    {
        if (checkLimit($_SESSION["R"] + 2))
        {
            $_SESSION["R"] = $_SESSION["R"] + 2;
        }

    }
    elseif ($_GET['action'] == 'G+')
    {
        if (checkLimit($_SESSION["G"] + 2))
        {
            $_SESSION["G"] = $_SESSION["G"] + 2;
        }

    }
    elseif ($_GET['action'] == 'B+')
    {
        if (checkLimit($_SESSION["B"] + 2))
        {
            $_SESSION["B"] = $_SESSION["B"] + 2;
        }
    }
    elseif ($_GET['action'] == 'R-')
    {
        if (checkLimit($_SESSION["R"] - 2))
        {
            $_SESSION["R"] = $_SESSION["R"] - 2;
        }
    }
    elseif ($_GET['action'] == 'G-')
    {
        if (checkLimit($_SESSION["G"] - 2))
        {
            $_SESSION["G"] = $_SESSION["G"] - 2;
        }
    }
    else
    {
        if (checkLimit($_SESSION["B"] - 2))
        {
            $_SESSION["B"] = $_SESSION["B"] - 2;
        }
    }

}

?>
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Colors</title>
    <link rel="stylesheet" href="../../lit/genstyle.css" type="text/css">
    <style>
      div.formcont { text-align: center; }
      div.ctlrow { text-align: center; width: 100%; height: 2.5em; }
      div.ctlrow div { display: inline-block; }
      form input { text-align: center; }
      form input.direction { width: 3em; height: 100%; }
      form input.pct { width: 3em; height: 50%; }
      form input.set { width: auto; height: 50%; }
      div.setarea { height: 3em; }
      div.setarea div { height: 1em; padding-top: 1em; }
      .red { background-color: rgb(90%,50%,50%); }
      .green { background-color: rgb(50%,90%,50%); }
      .blue { background-color: rgb(50%,50%,90%); }
      div.colblock { width: 50%; height: 2em;
          margin-left: auto; margin-right: auto; margin-top: 3em;
          text-align: center; padding-top: 1em;
      }
    </style>
  </head>
  <body>
   <h1>Colors</h1>
  <form method="GET" action="">
  <div class="formcont">
    <div class="ctlrow">
      <input type="submit" class="direction red" name="action" value="R+">
      <input type="submit" class="direction green" name="action" value="G+">
      <input type="submit" class="direction blue" name="action" value="B+">
 
      <input type="submit" class="direction red" name="action" value="R-">
      <input type="submit" class="direction green" name="action" value="G-">
      <input type="submit" class="direction blue" name="action" value="B-">
    </div>
  

    <div class="colblock" style="background-color: rgb(<?php echo $_SESSION["R"]; ?>, <?php echo $_SESSION["G"]; ?>, <?php echo $_SESSION["B"]; ?>); color: black">  RGB(<?php echo $_SESSION["R"]; ?>, <?php echo $_SESSION["G"]; ?>, <?php echo $_SESSION["B"]; ?>)</div>
  </div>
</form>  </body>
</html>

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