Simple PHP Calculator

echoCarlos · April 8, 2011

my first attempt at making a php script, included error handling incase the person dint pass in an integer.

any comments / suggestions would be highly appreciated as im still learning!

    
    <html>
<head>
	<title>Basic Calculator</title>
</head>
    <style type="text/css">
label
{
width: 4em;
float: left;
text-align: right;
margin-right: 0.5em;
display: block
}

.submit input
{
margin-left: 4.5em;
}
input
{
color: #781351;
background: #fee3ad;
border: 1px solid #781351
}

.submit input
{
color: #000;
background: #ffa20f;
border: 2px outset #d7b9c9
}
fieldset
{
border: 1px solid #781351;
width: 20em
}

legend
{
color: #fff;
background: #ffa20c;
border: 1px solid #781351;
padding: 2px 6px
} 

    </style>
<body>
    
     
    <form method="post" action="#">
    <fieldset>
<legend>Basic Maths Form</legend>
    <p>
    <label>First:</label>
    <input type="text" name="sum1" value="" />
    </p>
     
    <p>
    <label>Math: </label>
    <select name='calculate'>
    <option value='null'>Choose...</option>
    <option value='add'>+</option>
    <option value='multiply'>x</option>
    <option value='subtract'>-</option>
    <option value='divide'>/</option>
    </select>
    </p>
     
    <p>
    <label>Second: </label>
    <input type="text" name="sum2" value="" />
    </p>
    <b>Answere: </b> 
<?php

if(isset($_POST['sum1']) && isset($_POST['sum2']) && isset($_POST['calculate']))
{
$sum1 = strip_tags($_POST['sum1']);
$sum2 = strip_tags($_POST['sum2']);
$task = $_POST['calculate'];

if(!is_numeric($sum1) || !is_numeric($sum2))
{
	echo 'oh noes! it appears you dint enter a valid number.';
}
else
{
	switch($task)
	{
		case 'add':
			echo $sum1 + $sum2;
			break;
		case 'multiply':
			echo $sum1 * $sum2;
			break;
		case 'subtract':
			echo $sum1 - $sum2;
			break;
                       case 'divide':
                               echo $sum1 / $sum2;
                            break;
		    default:
		       echo 'OoOops!';
		       break;
	}
}
}

?>
    <p>
    <input type="submit" name="submit" value="Calculate" />
    </p>
    </fieldset>
    </form>
        
    	</body>
</html>

dawsba · April 8, 2011

heres some code i wrote awhile ago, it'll need some cleaning and you'll have to work some bits out

html:

<? if(!isset($iiX)){$iiX=1;} ?>
<form name="memnum" action="?ref=<?= $iiX; ?><?= $eXtra; ?>" enctype="multipart/form-data" method="post">
  <table align="center">
    <tr>
      <td colspan="3"><center><p><?= $title; ?></p></center></td>
    </tr>
    <tr>
      <td colspan="3">
        <? if(strtolower($kspecial) != 'password'){$kspecial = 'text';} ?>
        <input type="<?= $kspecial; ?>" name="pad" id="rfid" class="memnumfield" width="32" height="30"/>
      </td>
    </tr>    
<script>
      document.memnum.pad.focus();
      document.memnum.pad.select();
    </script>
  <?
  for($i = 1; $i <= 10; $i++)
  {
    if($i == 10 || $i == 7 || $i == 4 || $i == 1)
    { echo "<tr>"; }
    if($i == 10)
    {
      echo "
        <td>
          <input name=submitmem type=\"submit\" class=\"keypad_button\" value=\"ENTER\">
        </td>
        <td align=center>
          <input type=\"button\" class=\"keypad_button\" name=\"0\" value=\"0\" onclick=\"document.memnum.pad.value = document.memnum.pad.value+'0'\" onclick=\"goCheck(this)\">
        </td>
        <td>
          <input type=\"button\" class=\"keypad_button\" value=\"RESET\" onclick=\"document.memnum.pad.value = ''\">
        </td>
        ";
      }
      else
      {
        echo "
          <td>
            <input type=\"button\" class=\"keypad_button\" size=\"22\" name=\"".$i."\" value=\"".$i."\" onclick=\"document.memnum.pad.value = document.memnum.pad.value+'".$i."'\" onclick=\"goCheck(this)\">
          </td>
          ";
        }
        if($i == 9 || $i == 6 || $i == 3 || $i == 10){echo "</tr>";}
      }
  echo "
    <td colspan=\"3\">
	  <input type=\"button\" class=\"keypad_button\" size=\"66\" name=\"Cancel\" value=\"Cancel\" style=\"width:335px; height:35px;\" onclick=\"window.location='?ref=0'\">
    </td>
    ";
      ?>
      <tr><td colspan="3"> </td></tr>
  </table>
</form>

son0fhobs · April 24, 2011

my first attempt at making a php script, included error handling incase the person dint pass in an integer.

Search for javascript form validation and php sanitize forms. Easiest way is to just search for a sample script or plugin and edit for your needs.

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