验证码类

<?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/cour.ttf"){
   $this->width=$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));//卤鲁戮掳脩脮脡芦
   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);
    $fonturl="C:/Windows/Fonts/cour.ttf";//$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();