Random Verification Code

1<?PHP2 3     $type=1;4     $len=4;5     Header("Content-type:image/png");6     //test function7 Newcode ();8     9     functionNewcode ($type=1,$len=4){Ten          One         //Verification Code Content A         $str= "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; -          -         if($type==1){ the             $m=9; -}ElseIf($type==2){ -             $m=35; -}Else{ +             $m=61; -         } +         $code=""; A          for($i= 0;$i<$len;$i++){ at             $code.=$str[Rand(0,$m)];//Random Get Verification code -         } -     //Create a canvas -     $im=imagecreatetruecolor (50*$len, 50); -     //creating brushes and backgrounds -     $BG=imagecolorallocate ($im, 230,230,230); in     $HB=imagecolorallocate ($im,Rand(0,255),Rand(0,255),Rand(0,255)); -     //Background Fill toImagefill ($im, 0, 0,$BG); +     //add a random color to the noise point -      for($i= 0;$i<50*$len;$i++){ the         $HB=imagecolorallocate ($im,Rand(0,255),Rand(0,255),Rand(0,255)); *Imagesetpixel ($im,Rand(0,50*$len),Rand(0,50),$HB); $     }Panax Notoginseng     //adding random interference lines -      for($i= 0;$i<$len;$i++){ the         $HB=imagecolorallocate ($im,Rand(0,255),Rand(0,255),Rand(0,255)); +Imageline ($im,Rand(0,50*$len),Rand(0,50),Rand(0,50*$len),Rand(0,50),$HB); A     } the     //Add Verification Code +      for($i= 0;$i<$len;$i++){ -         $HB=imagecolorallocate ($im,Rand(0,255),Rand(0,255),Rand(0,255)); $Imagettftext ($im, 40,Rand( -30,30), 20+40*$i, 44,$HB, "Msyh.ttf",$code[$i]); $     } -     //Output Verification Code -Imagepng ($im); the     //Freeing Resources -Imagedestroy ($im);Wuyi  the      -     } Wu  -  About?>

Random Verification Code