【PHP】原生验证码

author：咔咔

 

 

/**
     * author:咔咔
     *
     * 验证码
     */
    public function codeAction() {

        Header("Content-type: image/PNG");

        $rand ="";

        for($i=0;$i<4;$i++){

$rand.=dechex(rand(0,15));

}

$im = imagecreate(100,30);

$gray = ImageColorAllocate($im, 200,200,200);

for($i=0;$i<3;$i++){

            $te=imagecolorallocate($im,rand(0,255),rand(0,255),rand(0,255));

        }
        imagefill($im,0,0,$gray);

        while(($rand=rand()%100000)<10000);

$_SESSION['rand']=$rand;

imagestring($im, 5, 30, 10, $rand, $te);


for($i=0;$i<200;$i++)
        {
            $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255));

            imagesetpixel($im, rand()%100 , rand()%50 , $randcolor);
        }

        imageline($im,0,rand(0,100),100,rand(0,15),$randcolor);

        imageline($im,0,rand(0,100),100,rand(0,15),$randcolor);

        imageline($im,0,rand(0,100),100,rand(0,15),$randcolor);

        ImagePNG($im);

        ImageDestroy($im);

    }