php驗證碼生成程序代碼

2024-09-04 11:44:27

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本文章給大家介紹利用session存儲與gd庫一并生成驗證碼程序,同時會加入一些干擾元素,這樣就可以簡單的防機器注冊了,下面我來給各位同學介紹介紹.

PHP驗證碼并生成圖片程序,采用了session識別,稍微改進了一下目前網絡上流傳的PHP驗證碼,加入雜點,數字顏色隨機顯示,控制4位數字顯示,話不多說了,程序如下,分享出來.

新建yz.php驗證碼生成文件,以下代碼需要打開php的GD庫,修改php.in文件的配置,把已經注釋掉的行之前的分號取消即可:extension=php_gd2.dll,代碼如下:

<?php

   class ValidationCode

   {

    //屬性

    private $width;

    private $height;

    private $codeNum;

       private  $image;

    private $disturbColorNum;  //干擾元素數目

    private  $checkCode;

    function __construct($width=80,$height=20,$codeNum=4)

     {

     $this->width=$width;

     $this->height=$height;

     $this->codeNum=$codeNum;

     $number=floor($width*$height/15);

     if($number>240-$codeNum)

    {

      $this->disturbColorNum=240-$codeNum;

     }else

      {

      $this->disturbColorNum=$number;

      }

      $this->checkCode=$this->createCheckcode();

    }

    function getCheckCode()

    {

           return $this->checkCode;

    }

    private function createImage(){

          $this->image=imagecreatetruecolor($this->width,$this->height);

    $backcolor=imagecolorallocate($this->image,rand(225,255),rand(225,255),rand(255,255));

    imagefill($this->image,0,0,$backcolor);

    $border=imagecolorallocate($this->image,0,0,0);

    imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$border);

    }

    private function setDisturbColor(){

     for($i=0;$i<$this->disturbColorNum;$i++){

      $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));

     imagesetpixel($this->image,rand(1,$this->width-2),rand(1,$this->height-2),$color);

     }

     for($i=0;$i<10;$i++)

     {

                  $color=imagecolorallocate($this->image,rand(0,255),rand(0,255),rand(0,255));

      imagearc($this->image,rand(-10,$this->width),rand(-10,$this->height),rand(30,300),rand(20,300),55,44,$color);

     }

    }

      private function outputText($fontFace=""){

    for($i=0;$i<$this->codeNum;$i++)

    {

     $fontcolor=imagecolorallocate($this->image,rand(0,128),rand(0,128),rand(0,128));

    if($fontFace=="")

   {

     $fontsize=rand(3,5);

     $x=floor($this->width/$this->codeNum)*$i+5;

     $y=rand(0,$this->height-15);

     imagechar($this->image,$fontsize,$x,$y,$this->checkCode{$i},$fontcolor);

    }

    else

   {

     $fontsize=rand(12,16);

     $x=floor(($this->width-8)/$this->codeNum)*$i+8;

     $y=rand($fontsize,$this->height-8);

     imagettftext($this->image,$fontsize,rand(-45,45),$x,$y,$fontcolor,$fontFace,$this->checkCode{$i});

    }

    }

   }

   private function createCheckCode(){

    $code="23456789abcdefghijkmnpqrstuvwrst";

    $str="";

    for($i=0;$i<$this->codeNum;$i++)

    {

     $char=$code{rand(0,strlen($code)-1)};

     $str.=$char;

    }

    return $str;

   }

   private function outputImage()

    {

    if(imagetypes()&IMG_GIF)

     {

       header("Content-Type:image/gif");

        imagepng($this->image);

     }else if(imagetypes()&IMG_JPG)

     {

        header("Content-Type:image/jpeg");

        imagepng($this->image);

     }else if(imagetypes()&IMG_PNG)

     {

        header("Content-Type:image/png");

      imagepng($this->image);

     }else if(imagetypes()&IMG_WBMP){

                 header("Content-Type:image/vnd.wap.wbmp");

     imagepng($this->image);

     }else

     {

      die("PHP不支持圖片驗證碼");

     }

    }

        //通過該方法向瀏覽器輸出圖像

    function  showImage($fontFace="")

    {

     //創建圖像背景

            $this->createImage();

     //設置干擾元素

           $this->setDisturbColor();

     //向圖像中隨機畫出文本

     $this->outputText($fontFace);

     //輸出圖像

     $this->outputImage();

    }

    function __destruct()

    {

     imagedestroy($this->image);

    }

   }

   function checklogin(){

        if(emptyempty($_POST['name']))

                die( '用戶名不能為空');

    if(emptyempty($_POST['password']))

     die("密碼不能為空");

    if($_SESSION['code']!=$_POST['vertify'])

     die("驗證碼輸入不正確".$_SESSION['code']);



    $username=$_POST['name'];

    $password=md5($_POST['password']);

    //檢查是否存在

         conndb($username,$password);

   }

   function conndb($name="",$ps=""){

        $conn=mysql_connect('localhost','root','123456');

       if(!$conn) die("數據庫連接失敗".mysql_error());

     mysql_select_db('5kan',$conn) or die('選擇數據庫失敗'.mysql_error());

  mysql_set_charset('utf8',$conn);

  $sql="select id from k_user where  username='{$name}' and password='{$ps}'";

  $result=mysql_query($sql) or die("SQL語句錯誤".mysql_error());

  if(mysql_num_rows($result)>0)  die("登錄成功");

  else  die("用戶名或者密碼錯誤");

  mysql_close($conn);

   }

    session_start();

   if(!isset($_POST['randnum']))

   {//開源代碼Vevb.com

     $code=new ValidationCode(120,20,4);

     $code->showImage("comicbd.ttf");  //顯示在頁面

  $_SESSION['code']=$code->getCheckCode();//保存在服務器中

   }

   else

   {

    checklogin();

   }

?>