首页手记完整代码：PHP 登录验证码

完整代码：PHP 登录验证码

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PHP

<?php

/**

这个是验证码制作经典类
*/
class Vcode{
private $width; //验证码宽度
private $height; //验证码高度
private $codeNum; //验证码字符个数
private $disturbColorNum; //干扰元素数量
private $checkCode; //验证码字符
private $image; //验证码资源
private $str; //生成的字符

function __construct($width=80,$height=20,$codeNum=5,$nan=1){
$this->width=$width;
$this->height=$height;
$this->codeNum=$codeNum;
//设置验证码干扰程度；
switch($nan){
case 1:$this->disturbColorNum=rand(2, 5); break;
case 2:$this->disturbColorNum=rand(5, 7); break;
case 3:$this->disturbColorNum=rand(7, 9); break;
case 4:$this->disturbColorNum=rand(11, 15); break;
case 5:$this->disturbColorNum=rand(15, 20); break;
default:$this->disturbColorNum=35;
}
$this->image=imagecreatetruecolor($this->width, $this->height);

}

/**
- */
  function index(){
  $size=rand(3, 5);
  $bai=imagecolorallocate($this->image, 255, 255, 255);
  imagefill($this->image, 0, 0, $bai);
  $this->ganrao($this->disturbColorNum);
  $this->str($this->codeNum);
  
  for ($i=0;$i<count($this->str);$i++){
  $x=floor($this->width/$this->codeNum)*$i+3;
  $y=rand(0, $this->height-imagefontheight($size));
  imagechar($this->image, $size, $x, $y,$this->str[$i] , imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)));
  }
  
  imagepng($this->image);
  $this->jiancha();
  }
/**
- 生成字符(大写字母，小写字母，数字)
- @param int $num 生成字符的个数
  */
  function str($num){
  $str=array();
  for ($i=0;$i<$num;$i++){
  $arr=array(chr(rand(48, 57)),chr(rand(97,122)),chr(rand(65,90)));
  $str[]=$arr[rand(0, 2)];
  }
  $this->str=$str;
  }
/**
- 干扰点，线函数
  */
  function ganrao($num){
  //生成线
  for($i=0;$i<$num;$i++){
  imageline($this->image, rand(0,$this->width), rand(0, $this->height), rand(0,$this->width), rand(0, $this->height),imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)));
  
  }
  //生成点
  for($i=0;$i<$num+rand(20,35);$i++){
  imagesetpixel($this->image, rand(0,$this->width), rand(0,$this->height), imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255)));
  }
}

/**
- 检查格式有更好的移植性
  */
  function jiancha(){
  
  if(function_exists("imagegif")){
  header("content-type:image/gif");
  }else if(function_exists("imageipeg")){
  header("content-type:image/jpeg");
  }else if(function_exists("imagepng")){
  header("content-type:image/png");
  }else if(function_exists("imagewbmp")){
  header("content-type:image/vnd.wap.wbmp");
  }else{
  die("在PHP服务器中不支持图像!");
  }
}

function session(){
return $this->str;
}
function __destruct(){
imagedestroy($this->image); //释放图像资源
}