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php二維碼加水印圖片

   $logo = 'logo.png';

  if(is_file($logo))

  {

  $QR = imagecreatefromstring(file_get_contents($filename));

  $logo = imagecreatefromstring(file_get_contents($logo));

  $QR_width = imagesx($QR);

  $QR_height = imagesy($QR);

  $logo_width = imagesx($logo);

  $logo_height = imagesy($logo);

  $logo_qr_width = $QR_width / 5;

  $scale = $logo_width / $logo_qr_width;

  $logo_qr_height = $logo_height / $scale;

  $from_width = ($QR_width - $logo_qr_width) / 2;

  imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width, $logo_qr_height, $logo_width, $logo_height);

  imagepng($QR,$filename);

  }

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