Php Tortendiagramm erstellen

Mit dem Code lassen sich ganz einfach Tortendiagramme erstellen.
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Der hier verwendete Code

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    <?php
$piece_values = array(70, 15, 10, 7);  
$piece_names = array("MSIE", "Firefox", "Opera", "Safari");  
$height = 580; $width = 600;  
$height3d = 15;  
$no_sort = false; // Sortierung an  
function graph_colors($im) {
  $colors["background"] = ImageColorAllocate($im, 255, 255, 255);
  $colors["text"] = ImageColorAllocate($im, 0, 0, 0);
  $colors[0] = ImageColorAllocate($im, 255, 80, 80);
  $colors[1] = ImageColorAllocate($im, 254, 255, 80);
  $colors[2] = ImageColorAllocate($im, 81, 80, 255);
  $colors[3] = ImageColorAllocate($im, 255, 80, 254);
  $colors[4] = ImageColorAllocate($im, 80, 255, 81);
  $colors[5] = ImageColorAllocate($im, 80, 255, 255);
  $colors_dark[0] = ImageColorAllocate($im, 155, 0, 0);
  $colors_dark[1] = ImageColorAllocate($im, 154, 155, 0);
  $colors_dark[2] = ImageColorAllocate($im, 0, 0, 155);
  $colors_dark[3] = ImageColorAllocate($im, 155, 0, 154);
  $colors_dark[4] = ImageColorAllocate($im, 0, 155, 0);
  $colors_dark[5] = ImageColorAllocate($im, 0, 155, 155);
  return array("colors" => $colors, "colors_dark" => $colors_dark);
 }  
function graph_pie_3d($piece = array(), $piece_text = array(), $height = 180, $width = 200, $height3d = 15, $no_sort = false) {
  header("Content-type: image/png");
  $im = ImageCreateTrueColor($width, $height);
  $graph_colors = graph_colors($im);
  $colors = $graph_colors["colors"];
  $colors_dark = $graph_colors["colors_dark"];
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