A Self-Processing Sticky Get Form

This PHP example program demonstrates how to write and handle a self-processing sticky get form.

SelfProcessingStickyGet.php

<!DOCTYPE html>
<html>
<head>
  <title>XoaX.net's PHP</title>
</head>
<body>
<?php
  if (isset($_GET['sX'])) {
    $dX = htmlspecialchars($_GET['sX']);
  }
  if (isset($_GET['sY'])) {
    $dY = htmlspecialchars($_GET['sY']);
  }
?>

<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="GET">
X = <input type="text" name="sX" value="<?php echo $dX ?>"/><br /><br />
Y = <input type="text" name="sY" value="<?php echo $dY ?>"/><br /><br />
<input type="submit" name"sMultiply">
</form>

<?php
  // Only shown in the subsequent request
  if (is_numeric($dX) && is_numeric($dY)) {
    $dProduct = ($dX*$dY);
    printf("%g * %g = %g", $dX, $dY, $dProduct);
  }
?>

</body>
</html>

Core PHP

A Self-Processing Sticky Get Form

SelfProcessingStickyGet.php

Output