Using GD image verification code to generate and save in PHP

    //Painting cloth$img= Imagecreatetruecolor ( -, +);//Three colors$black= Imagecolorallocate ($img,0x00,0x00,0x00);$green= Imagecolorallocate ($img,0x00,0xFF,0x00);$white= Imagecolorallocate ($img,0xFF,0xFF,0xFF);//Fill whiteImagefill ($img,0,0,$white);//Generate a random verification code$code=''; for($i=0;$i<4;$i++) {$code. = Rand (0,9);} Imagestring ($img,5,Ten,Ten,$code,$black);//Add noise interference. for($i=0;$i< -;$i+ +) {Imagesetpixel ($img, Rand (0, -), Rand (0, -) ,$black); Imagesetpixel ($img, Rand (0, -), Rand (0, -) ,$green);}//png output Verification code JPEG output to the current folderHeader"Content-type:image/png"); Imagepng ($img); Imagejpeg ($img,"./ok.jpeg", the); Imagedestroy ($img);```
     //Painting cloth$img= Imagecreatetruecolor ( -, +);//Three colors$black= Imagecolorallocate ($img,0x00,0x00,0x00);$green= Imagecolorallocate ($img,0x00,0xFF,0x00);$white= Imagecolorallocate ($img,0xFF,0xFF,0xFF);//Fill whiteImagefill ($img,0,0,$white);//Generate a random verification code$code=''; for($i=0;$i<4;$i++) {$code. = Rand (0,9);} Imagestring ($img,5,Ten,Ten,$code,$black);//Add noise interference. for($i=0;$i< -;$i+ +) {Imagesetpixel ($img, Rand (0, -), Rand (0, -) ,$black); Imagesetpixel ($img, Rand (0, -), Rand (0, -) ,$green);}//png output Verification code JPEG output to the current folderHeader"Content-type:image/png"); Imagepng ($img); Imagejpeg ($img,"./ok.jpeg", the); Imagedestroy ($img);

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The above is introduced in PHP using GD image verification code generation and preservation, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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