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Php ile resim olusturma

<?
 
  $imagekod = '';
 
  for ($i = 0; $i < 8; $i++) {
 
  $imagekod .= chr(mt_rand(100,120));
  $imagekod=strtoupper($imagekod);
  }
 // set up image
   $height = 30;
   $width = 100;
   $im = ImageCreate($width, $height);
   $white = ImageColorAllocate ($im, 255, 255, 255);
   $black = ImageColorAllocate ($im, 128, 0, 0);
 
 // draw on image
   ImageFill($im, 0, 0, $black);
 //  ImageLine($im, 0, 0, $width, $height, $white);
   ImageString($im, 300, 15, 10, $imagekod, $white);
 
 // output image
   Header ("Content-type: image/png");
   ImagePng ($im);
 
 // clean up
   ImageDestroy($im);
 
 ?>

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