Verification code class and usage in PHP_PHP tutorial

Note: Add the public page to session_start();

session_start();

ini_set('display_errors', 'Off');

class CCheckCodeFile

{

//Verification code digits www.2cto.com

var $mCheckCodeNum = 4;

//Generated verification code

var $mCheckCode = '';

//Verification code picture

      var $mCheckImage = '';

//Interfering pixels

      var $mDisturbColor = '';

//Verification code image width

      var $mCheckImageWidth = '80';

//Verification code image width

      var $mCheckImageHeight = '20';

//Output header

        function OutFileHeader()

          {

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

}

//Generate verification code

        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;

}

//Generate verification code image

Function CreateImage()

          {

                     $this->mCheckImage = @imagecreate ($this->mCheckImageWidth,$this->mCheckImageHeight);

Imagecolorallocate ($this->mCheckImage, 255, 255, 255);

                 return $this->mCheckImage;

}

//Set the interference pixels of the image

       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);

              }

}

//Set the size, width and height of the verification code image

        function SetCheckImageWH($width,$height)

          {

If($width==''||$height=='')return false;

                     $this->mCheckImageWidth = $width;

                     $this->mCheckImageHeight = $height;

                return true;

}

//Draw the verification codes one by one on the verification code picture

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);

              }

}

//Output verification code image

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);//Set the size of the verification code image

$c_check_code_image->OutCheckImage();

?>

How to use:

          Verification code

        

Verify it is correct

session_start();

if($_POST["number"] == $_SESSION["code_str"]){

//       echo("Verification code is correct");

}else{

echo "

                                                                                                                         

                                                                                                                                                                                                                 

function ok()

                            {

 

                            s--;

 

                            document.getElementById('tips').innerHTML=s;

 

                            if(s==0)

 

                            {

 

                            clearTimeout(t);

 

                            history.go(-1);

 

                            }

 

                            }

 

                            var t=setInterval('ok()',1000);

 

                    

 

" . "请输入的验证码,请重新输入秒之后，将为您跳转到上一页";

  }

 

摘自 http://itsafe.org/?p=384

http://www.bkjia.com/PHPjc/478478.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478478.htmlTechArticle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...