php 生成验证码代码

php生成验证码文件是一项学php的朋友都应该知道的技术哦,这个不既可以让你的网站安全提高一些,也可以注止一些机器注册之类的问题哦,下面我们就来看一个简单的生成验证码程序

<?
/ eckNum.php
session_start();
function random(){
$srcstr="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
mt_srand();
$strs="";
for($i=0;$i<6;$i++){
$strs.=$srcstr[mt_rand(0,35)];
}
return strtoupper($strs);
}
$str=random(4); //随就去干机生成的字符串
$width = 50; //验证码图片的宽度
$height = 25; //验证码图片的高度
@header("Content-Type:image/png");
$_SESSION["code"] = $str;
//echo $str;
$im=imagecreate($width,$height);
//背景色
$back=imagecolorallocate($im,0xFF,0xFF,0xFF);
//模糊97xxoo点颜色
$pix=imagecolorallocate($im,187,230,247);
//字体色
$font=imagecolorallocate($im,41,163,238);
//绘模糊作用的点
mt_srand();
for($i=0;$i<1000;$i++)
{
imagesetpixel($im,mt_rand(0,$width),mt_rand(0,$height),$pix);
}
imagestring($im, 5, 7, 5,$str, $font);
imagerectangle($im,0,0,$width-1,$height-1,$font);
imagepng($im);
imagedestroy($im);
$_SESSION["code"] = $str;
?> 

,我们欺骗主机的方法来做,就是用fsockopen向主机发送一个用户包

function get_remote($body){
 set_time_limit(0);
 $img_array = array();
 $img_path = "get_pic/";
 preg_match_all("/(src|SRC)=["|'| ]{0,}(http://(.*).(gif|jpg|jpeg|png))/isU",$body,$img_array);
 $img_array = array_unique($img_array[2]);
 foreach ($img_array as $key => $value) {
  $get_file = @file_get_contents($value);
  $filetime = time();   
  !is_dir($img_path) ? mkdir($img_path) : null; 
  $filename = date("YmdHis",$filetime).rand(1,999).'.'.substr($value,-3,3);
  if(empty($get_file)){
   sleep(3);
   $get_file = @file_get_contents($value);
   if(empty($get_file)){
    $body = preg_replace("/".addcslashes($value,"/")."/isU", 'http://www.111cn.net/notfound.jpg', $body);
    continue;
    }
  }
  if(!empty($get_file) ){
   $fp = fopen($img_path.$filename,"w");
   if(fwrite($fp,$get_file)){         
    $body = preg_replace("/".addcslashes($value,"/")."/isU", $img_path.$filename, $body);
   }
  }
  fclose($fp);
  sleep(1);
 }
 
 //$body =str_replace('<img','<input class="" type="image" ',$body); 
 //$body =str_replace('<IMG','<input class="" type="image" ',$body);
 return $body;
 
}

下面我们来看看fsockopen的方法喽.

if($gcookie=="" && !empty($rfurl)) $gcookie = RefurlCookie($rfurl);
   $sessionQuery = "GET $gquery HTTP/1.1rn";
   $sessionQuery .= "Host: $ghostrn";
   $sessionQuery .= "Referer: $rfurlrn";
   $sessionQuery .= "Accept: */*rn";
   $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)rn";
   if($gcookie!=""&&!ereg("[rn]",$gcookie)) $sessionQuery .= $gcookie."rn";
   $sessionQuery .= "Connection: Keep-Alivernrn";
   $errno = "";
   $errstr = "";
$url ='http://www.moko.cc';
$m_fp = fsockopen($url,80,$errno,$errstr,10);
fwrite($m_fp,$sessionQuery);

function RefurlCookie($gurl){
 global $gcookie,$lastRfurl;
 $gurl = trim($gurl);
 if(!empty($gcookie) && $lastRfurl==$gurl) return $gcookie;
 else $lastRfurl=$gurl;
 if(trim($gurl)=='') return '';
 $urlinfos = GetHostInfo($gurl);
  $ghost = $urlinfos['host'];
  $gquery = $urlinfos['query'];
  $sessionQuery = "GET $gquery HTTP/1.1rn";
  $sessionQuery .= "Host: $ghostrn";
  $sessionQuery .= "Accept: */*rn";
  $sessionQuery .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.00; Windows 98)rn";
  $sessionQuery .= "Connection: Closernrn";
  $errno = "";
  $errstr = "";
  $m_fp = fsockopen($ghost, 80, $errno, $errstr,10) or die($ghost.'<br />');
  fwrite($m_fp,$sessionQuery);
  $lnum = 0;
  //获取详细应答头
  $gcookie = "";
 while(!feof($m_fp)){
   $line = trim(fgets($m_fp,256));
   if($line == "" || $lnum>100) break;
   else{
    if(eregi("^cookie",$line)){
     $gcookie = $line;
     break;
    }
   }
  }
   fclose($m_fp);
   }
  哈这样的话就可以保存远程有图片防盗的主机的图片了喽.

 ,下面我们来看看

第一种方法:就是用smary的模板来生成.

require('smarty/Smarty.class.php');
$t = new Smarty;
$t->assign("title","Hello World!");
$content = $t->fetch("templates/index.htm");
//这里的 fetch() 就是获取输出内容的函数,现在$content变量里面,就是要显示的内容了
$fp = fopen("archives/2005/05/19/0001.html", "w");
fwrite($fp, $content);
fclose($fp);
?>

另一种方法是用php od_get_contents来生成
ob_start();
echo "Hello World!";
$content = ob_get_contents();//取得php页面输出的全部内容
$fp = fopen("archives/2005/05/19/0001.html", "w");
fwrite($fp, $content);
fclose($fp);

 第三种方法就是用php自然的函数fopen来直接保存.

<?php
$ip = "192.168.0.1";

if(!filter_var($ip, FILTER_VALIDATE_IP))
 {
 echo "IP is not valid";
 }
else
 {
 echo "IP is valid";
 }
?>

输出结果。

is is valid

class GetMacAddr{   
  
       var $return_array = array(); // 返回带有MAC地址的字串数组   
       var $mac_addr;   
  
       function GetMacAddr($os_type){   
            switch ( strtolower($os_type) ){   
                     case "linux":   
                               $this->forLinux();   
                               break;   
                     case "solaris":   
                               break;   
                     case "unix":   
                               break;   
                     case "aix":   
                               break;   
                     default:   
                               $this->forWindows();   
                               break;   
  
            }   
  
              
            $temp_array = array();   
            foreach ( $this->return_array as $value ){   
  
                      if (   
preg_match("/[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f]/i",$value,   
$temp_array ) ){   
                               $this->mac_addr = $temp_array[0];   
                               break;   
                     }   
  
            }   
            unset($temp_array);   
            return $this->mac_addr;   
       }   
  
  
       function forWindows(){   
            @exec("ipconfig /all", $this->return_array);   
            if ( $this->return_array )   
                     return $this->return_array;   
            else{   
                     $ipconfig = $_SERVER["WINDIR"]."system32ipconfig.exe";   
                     if ( is_file($ipconfig) )   
                        @exec($ipconfig." /all", $this->return_array);   
                     else  
                        @exec($_SERVER["WINDIR"]."systemipconfig.exe /all", $this->return_array);   
                     return $this->return_array;   
            }   
       }   
  
  
  
       function forLinux(){   
            @exec("ifconfig -a", $this->return_array);   
            return $this->return_array;   
       }   
  
}   
//方法使用   
//$mac = new GetMacAddr(PHP_OS);   
//echo $mac->mac_addr;