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<?$letters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNPQRSTUVWXYZ123456789";$letters=str_shuffle($letters);$enc = substr($letters,2,7);setcookie("captcha",md5($enc));Header ("Content-type: image/png");$img_handle = imageCreateFromPNG("imagecode_bg.png");$color = ImageColorAllocate ($img_handle, 450, 450, 450);ImageString ($img_handle, 5, 20, 13,  $enc, $color);ImagePng ($img_handle);ImageDestroy ($img_handle);?>