PHP中验证码类及使用方法

 

备注:将公共页面加入session_start();

 

<?php

session_start();

ini_set(‘display_errors’, ‘off’);

class ccheckcodefile

{

       //验证码位数 www.2cto.com

 

       var $mcheckcodenum  = 4;

 

       //产生的验证码

       var $mcheckcode   = ”;

 

       //验证码的图片

       var $mcheckimage  = ”;

 

       //干扰像素

       var $mdisturbcolor  = ”;

 

       //验证码的图片宽度

       var $mcheckimagewidth = ’80’;

 

       //验证码的图片宽度

       var $mcheckimageheight  = ’20’;

 

       //输出头

       function outfileheader()

       {

              header (“content-type: image/png”);

       }

 

       //产生验证码

       function createcheckcode()

       {

              //$this->mcheckcode = strtoupper(substr(md5(rand()),0,$this->mcheckcodenum));

              $this->mcheckcode = strtoupper(substr(rand(0,9999999999),0,$this->mcheckcodenum));

              session_cache_expire(60);

              session_start();

              $_session[“code_str”] = $this->mcheckcode;

              return $this->mcheckcode;

       }

 

       //产生验证码图片

       function createimage()

       {

              $this->mcheckimage = @imagecreate ($this->mcheckimagewidth,$this->mcheckimageheight);

              imagecolorallocate ($this->mcheckimage, 255, 255, 255);

              return $this->mcheckimage;

       }

 

       //设置图片的干扰像素

       function setdisturbcolor()

       {

              for ($i=0;$i<=128;$i++)

              {

                     $this->mdisturbcolor = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255));

                     imagesetpixel($this->mcheckimage,rand(1,100),rand(1,100),$this->mdisturbcolor);

              }

       }

 

       //设置验证码图片的大小\宽\高

       function setcheckimagewh($width,$height)

       {

              if($width==”||$height==”)return false;

              $this->mcheckimagewidth  = $width;

              $this->mcheckimageheight = $height;

              return true;

       }

 

       //在验证码图片上逐个画上验证码

       function writecheckcodetoimage()

       {

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

              {

                     $bg_color = imagecolorallocate ($this->mcheckimage, rand(0,255), rand(0,255), rand(0,255));

                     $x = floor($this->mcheckimagewidth/$this->mcheckcodenum)*$i;

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

                     imagechar ($this->mcheckimage, 5, $x, $y, $this->mcheckcode[$i], $bg_color);

              }

       }

 

       //输出验证码图片

       function outcheckimage()

       {

              $this ->outfileheader();

              $this ->createcheckcode();

              $this ->createimage();

              $this ->setdisturbcolor();

              $this ->writecheckcodetoimage();

              imagepng($this->mcheckimage);

              imagedestroy($this->mcheckimage);

       }

}

 

$c_check_code_image = new ccheckcodefile();

//$c_check_code_image ->setcheckimagewh(100,50);//设置显示验证码图片的尺寸

$c_check_code_image->outcheckimage();

?>

 

 

 

使用方法:

<tr>

      <td align=”center” valign=”middle”>验证码</td>

      <td align=”center” valign=”middle”><input name=”number” type=”text” style=”width:80px;”>

      <img src=”code.php” id=”yzm” onclick=”this.src=’code.php?abc=’+math.random()” alt=”图片看不清？点击重新得到验证码” style=”cursor:hand;” />

</td>

    </tr>

 

 

验证是否正确

 

session_start();

 

  if($_post[“number”] == $_session[“code_str”]){

  //      echo(“验证码正确”);

  }else{

        echo “

 

                     <script>

 

                            var s=10;

 

                            function ok()

 

                            {

 

                            s–;

 

                            document.getelementbyid(‘tips’).innerhtml=s;

 

                            if(s==0)

 

                            {

 

                            cleartimeout(t);

 

                            history.go(-1);

 

                            }

 

                            }

 

                            var t=setinterval(‘ok()’,1000);

 

                     </script>

 

” . “请输入的验证码,请重新输入<span id=’tips’></span>秒之后，将为您跳转到<a href=\”javascript:history.go(-1)\”>上一页</a>”;

  }

 

摘自 https://itsafe.org/?p=384