Picturicon prototype

Picturicon.php

<?php
Class Picturicon {
  function addIcon($avatar, $icon, $saveAs) {
    function x($image) {
      $x = getimagesize($image);
      return $x[0];
    }

    function y($image) {
      $y = getimagesize($image);
      return $y[1];
    }

    function createImage($image) {
      if (exif_imagetype($image) == 1) {
        $image = imagecreatefromgif($image);
      } elseif (exif_imagetype($image) == 2) {
        $image = imagecreatefromjpeg($image);
      } elseif (exif_imagetype($image) == 3) {
        $image = imagecreatefrompng($image);
      }
      return $image;
    }

    if ($avatar && $icon) {
      $resAvatar = x($avatar) * y($avatar);
      $resIcon = x($icon) * y($icon);

      if ($resAvatar >= $resIcon) {
        $canvas = createImage($avatar);
        $layer1 = createImage($avatar);
        $layer2 = createImage($icon);
        $iconX = x($avatar) - x($icon);
        $iconY = y($avatar) - y($icon);

        imagecopy(
                   $canvas,
                   $layer2,
                   $iconX, $iconY,
                   0, 0,
                   x($icon), y($icon)
                 );
        imagecopymerge(
                        $layer1,
                        $canvas,
                        $iconX, $iconY,
                        0, 0,
                        x($icon), y($icon),
                        100
                      );
        imagepng($canvas, $saveAs);

        imagedestroy($layer2);
        imagedestroy($canvas);
      } else {
        echo "Picturicon: The avatar is smaller than the icon! Restart processing.";
      }
    } else {
      echo "Picturicon: Missing file (s) to process. Restart processing.";
    }
  }
}
?>