<?php

    class Imagecode{

        private $width ;

        private $height;

        private $counts;

        private $distrubcode;

        private $fonturl;

        private $session;

        function __construct($width = 120,$height = 30,$counts = 5,$distrubcode="1235467890qwertyuipkjhgfdaszxcvbnm",$fonturl="C:\Windows\Fonts\TektonPro-BoldCond.otf"){

            $this->width=$width;

            $this->height=$height;

            $this->counts=$counts;

            $this->distrubcode=$distrubcode;

            $this->fonturl=$fonturl;

            $this->session=$this->sessioncode();

            session_start();

            $_SESSION['code']=$this->session;

        }

         function imageout(){

            $im=$this->createimagesource();

            $this->setbackgroundcolor($im);

            $this->set_code($im);

            $this->setdistrubecode($im);

            ImageGIF($im);

            ImageDestroy($im);

        }

        private function createimagesource(){

            return imagecreate($this->width,$this->height);

        }

        private function setbackgroundcolor($im){

            $bgcolor = ImageColorAllocate($im, rand(200,255),rand(200,255),rand(200,255));//±³¾°ÑÕÉ«

            imagefill($im,0,0,$bgcolor);

        }

        private function setdistrubecode($im){

            $count_h=$this->height;

            $cou=floor($count_h*2);

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

                $x=rand(0,$this->width);

                $y=rand(0,$this->height);

                $jiaodu=rand(0,360);

                $fontsize=rand(8,15);

                $fonturl=$this->fonturl;

                $originalcode = $this->distrubcode;

                $countdistrub = strlen($originalcode);

                $dscode = $originalcode[rand(0,$countdistrub-1)];

                $color = ImageColorAllocate($im, rand(40,140),rand(40,140),rand(40,140));

                imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$dscode);

            }

        }

        private function set_code($im){

                $width=$this->width;

                $counts=$this->counts;

                $height=$this->height;

                $scode=$this->session;

                $y=floor($height/2)+floor($height/4);

                $fontsize=rand(30,35);

                $fonturl="C:\Windows\Fonts\AdobeGothicStd-Bold.otf";//$this->fonturl;

                $counts=$this->counts;

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

                    $char=$scode[$i];

                    $x=floor($width/$counts)*$i+8;

                    $jiaodu=rand(-20,30);

                    $color = ImageColorAllocate($im,rand(0,50),rand(50,100),rand(100,140));

                    imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$char);

                }

        }

        private function sessioncode(){

                $originalcode = $this->distrubcode;

                $countdistrub = strlen($originalcode);

                $_dscode = "";

                $counts=$this->counts;

                for($j=0;$j<$counts;$j++){

                    $dscode = $originalcode[rand(0,$countdistrub-1)];

                    $_dscode.=$dscode;

                }

                return $_dscode;

        }

    }

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

    $imagecode=new  Imagecode(160,50);

    $imagecode->imageout();