PHP: Exemple d’une calculatrice basée sur un formulaire

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<html>
 
 <head>
 
 </head>
 
 <body>
<form action = "<?php print $_SERVER['PHP_SELF'];?>" method = "post">
 
  Valeur 1:
<input type = "text" name = "val1" size = "10">
  Valeur 2:
<input type = "text" name = "val2" size = "10">
 
  Opération: 
<input type = "radio" name = "operation" value = "add"> Addition
<input type = "radio" name = "operation" value = "sous"> Sustraction
<input type = "radio" name = "operation" value = "mul"> Multiplication
<input type = "radio" name = "operation" value = "div"> Division
<hr />
<input type = "submit" value = "Calculate">
<input type = "reset" value = "Clear"></form>
 
 </body>
 
</html>
 
 <?php
 
if(isset($_POST['val1'])&#038;&isset($_POST['val2'])&#038;&isset($_POST['operation']))
{
  $val1 = $_POST['val1'];
  $val2 = $_POST['val2'];
  $operation = $_POST['operation'];
 
  if( is_numeric( $val1 ) &#038;& is_numeric( $val2 ) )
  {
      if( $operation != null )
      {
          switch( $operation )
          {
              case "add" : $result = $val1 + $val2; break;
              case "mul" : $result = $val1 * $val2; break;
              case "sous" : $result = $val1 - $val2; break;
              case "div" : $result = $val1 / $val2; break;
          }
        echo( "Résultat de Calcul:<b> $result</b>" );
      }
  }
  else
  {
    echo( "Données invalide, veillez ré-essayer ");
  }
 
  }
 ?>
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