php标准生成验证码程序

<?php教程

session_start();

$enablegd = 1;
//判断图像处理函数是否存在
$funcs = array('imagecreatetruecolor','imagecolorallocate','imagefill','imagestring','imageline','imagerotate','imagedestroy','imagecolorallocatealpha','imageellips教程e','imagepng');
foreach($funcs as $func)
{
 if(!function_exists($func))
 {
  $enablegd = 0;
  break;
 }
}

ob_clean(); //清理缓冲

if($enablegd)
{
 //create captcha
 $consts = 'cdfgkmnpqrstwxyz23456';
 $vowels = 'aek23456789';
 for ($x = 0; $x < 6; $x++)
 {
  $const[$x] = substr($consts, mt_rand(0,strlen($consts)-1),1); //获取$consts中的一个随机数
  $vow[$x] = substr($vowels, mt_rand(0,strlen($vowels)-1),1); //获取$vowels中的一个随机数
 }
 $radomstring = $const[0] . $vow[0] .$const[2] . $const[1] . $vow[1] . $const[3] . $vow[3] . $const[4];
 $_SESSION['checkcode'] = $string = substr($radomstring,0,4); //显示4个字符

 $imageX = strlen($radomstring)*8; //图像的宽
 $imageY = 20;      //图像的高
 $im = imagecreatetruecolor($imageX,$imageY); //新建一个真彩色图像

 //creates two variables to store color
 $background = imagecolorallocate($im, rand(180, 250), rand(180, 250), rand(180, 250)); //背景色
 $foregroundArr = array(imagecolorallocate($im, rand(0, 20), rand(0, 20), rand(0, 20)),
  imagecolorallocate($im, rand(0, 20), rand(0, 10), rand(245, 255)),
  imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(0, 10)),
  imagecolorallocate($im, rand(245, 255), rand(0, 20), rand(245, 255))
 );
 $foreground2 = imagecolorallocatealpha($im, rand(20, 100), rand(20, 100), rand(20, 100),80); //分配颜色并说明透明度
 $middleground = imagecolorallocate($im, rand(200, 160), rand(200, 160), rand(200, 160)); //中间背景
 $middleground2 = imagecolorallocatealpha($im, rand(180, 140), rand(180, 140), rand(180, 140),80); //中间背景2

 //与左上角的颜色相同的都会被填充
 imagefill($im, 0, 0, imagecolorallocate($im, 250, 253, 254));
 //往图像上写入文字
 imagettftext($im, 12, rand(30, -30), 5, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf', $string[0]);
 imagettftext($im, 12, rand(50, -50), 20, rand(14, 16), $foregroundArr[rand(0,3)], 'C:WindowsFontsArial.ttf', $string[1]);
 imagettftext($im, 12, rand(50, -50), 35, rand(14, 16), $foregroundArr[rand(0,3)],'C:WindowsFontsArial.ttf', $string[2]);
 imagettftext($im, 12, rand(30, -30), 50, rand(14, 16), $foregroundArr[rand(0,3)],'C:WindowsFontsArial.ttf', $string[3]);

 //画边框
 $border = imagecolorallocate($im, 133, 153, 193);
 imagerectangle($im, 0, 0, $imageX - 1, $imageY - 1, $border);

 //画一些随机出现的点
 $pointcol = imagecolorallocate($im, rand(0,255), rand(0,255), rand(0,255));
 for ($i=0;$i<80;$i++)
 {
  imagesetpixel($im,rand(2,$imageX-2),rand(2,$imageX-2),$pointcol);
 }
 //画随机出现的线
 for ($x=0; $x<9;$x++)
 {
  if(mt_rand(0,$x)%2==0)
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999)); //画线
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground2); //画椭圆
  }
  else
  {
   imageline($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 999999));
   imageellipse($im, rand(0, 120), rand(0, 120), rand(0, 120), rand(0, 120), $middleground);
  }
 }
 //output to browser
 header("content-type:image/pngrn");
 imagepng($im);
 imagedestroy($im);
}
else
{
 $files = glob(XINCHENG_ROOT.'images/checkcode/*.jpg');
 if(!is_array($files)) die('请检查文件目录完整性:/images/checkcode/');

 $checkcodefile = $files[rand(0, count($files)-1)]; //随机其中一个文件
 $_SESSION['checkcode'] = substr(basename($checkcodefile), 0, 4); //获得文件名

 header("content-type:image/jpegrn");
 include $checkcodefile;
}
?>

<?php
/*

php 分页类
只要实现分页。不与数据库教程连接。

如果是伪静态 只需修改84行以下的A标签即可 如   "<a href='index_".$i.".html'>".$i."</a>"  (index_表示你的伪静态地址) 其他的A标签页是一样

*/

/*

          鄙人工作时间写了个简单实用的  php 分页类   现和大家分享。。
   
    QQ：348145486
   
    email:  tzk_php@163.com 
   
    欢迎大家一起学习交流

*/

class Page{

 public $page_size="20";                     //每页显示的数据数目
 public $page_num;                           //总的数据数目
 public $page_url="";                        //分页的当前URL
 public $pageval;                            //分页的当前页
 public $page_ys;                            //总的页数
 public $page_tf=false;                      //判断能否执行分页的值
 public $page;

 /**********初始化分页类************/
   
 function __construct($page_num,$page_size=""){
  $this->page_num=$page_num;                                                            //获取所有需要显示的数据数目

  if($page_size!=""){
   $this->page_size=$page_size;                                                      //获取每页显示数据数据
  }

  $this->page_url=$_SERVER['SCRIPT_NAME'];                                              //获取当前的URL地址

  if($this->page_num>$this->page_size){                                                 //判断是否能执行分页
   $this->page_ys=ceil($this->page_num/$this->page_size);                            //获取总的分页数
   $this->page_tf=true;                                                              //将分页权限复制以便下面再次判断
  }

  if(!empty($_GET['page'])){                                                            //只允许页码在分页数范围内
   if($_GET['page']>="1"){
    if($_GET['page']<=$this->page_ys){
     $this->pageval=$_GET['page'];
    }else{
     $this->pageval=$this->page_ys;
    }
   }else{
    $this->pageval="1";
   }
  }else{
   $this->pageval="1";
  }

  $this->page=($this->pageval-1)*$this->page_size;                                       //查询数据库数据时的第一条数据

 }

 /************执行分页 返回分页按钮**********/

 function page_fy($val=""){
  if($this->page_tf==true){
   if($val==""){
    return $this->page_style_one();
   }else if ($val=="1"){
     return $this->page_style_two();
   }elseif ($val=="2"){
    return $this->page_style_three();
   }
  }
 }

 /**********分页按钮 样式一*********/

 function page_style_one(){
  if($this->pageval=="1"){
   $up="1";
  }else{
   $up=$this->pageval-1;
  }

  if($this->pageval>=$this->page_ys){
   $down=$this->page_ys;
  }else{
   $down=$this->pageval+1;
  }
  $one="<a href='".$this->page_url."?page=1'>首页</a>";
  $two="<a href='".$this->page_url."?page=".$up."'>上一页</a>";
  $three="<a href='".$this->page_url."?page=".$down."'>下一页</a>";
  $four="<a href='".$this->page_url."?page=".$this->page_ys."'>末页</a>";
  return $page_echo = $one.$two.$three.$four;
 }

 /***********分页按钮 样式二*************/

 function page_style_two(){                                                 //下面这个呢，逻辑很复杂，思维很林乱，
  $page_echo="";
  if($this->pageval=="1"){
   $up="1";
  }else{
   $up=$this->pageval-1;
  }

  if($this->pageval>=$this->page_ys){
   $down=$this->page_ys;
  }else{
   $down=$this->pageval+1;
  }
  $two="<a href='".$this->page_url."?page=".$up."'>上一页</a>";
  $three="<a href='".$this->page_url."?page=".$down."'>下一页</a>";
  
  if($this->page_ys>"6"){

      if($this->pageval<=3){
       $i=2;
       $i_to=5;       
      }elseif ($this->pageval>=($this->page_ys-2)){
       $i=$this->page_ys-4;
       $i_to=$this->page_ys-1;
      }else{
       $i=$this->pageval-2;
       $i_to=$this->pageval+2;
      }
     
  if($this->pageval>4){
   $page_one="...";
  }else{
   $page_one="";
   }

  if($this->pageval<($this->page_ys-3)){
   $page_two="...";
  }else{
   $page_two="";
   }
 
  for ($i;$i<=$i_to;$i++){
   $page_echo.="<a href='".$this->page_url."?page=".$i."'>".$i."</a>";                //如果是伪静态 只需修改A标签即可 如   "<a href='index_".$i.".html'>".$i."</a>"   其他的A标签页是一样
  }   
 
  }else{
   for ($i=2;$i<=($this->page_ys-1);$i++){
       $page_echo.="<a href='".$this->page_url."?page=".$i."'>".$i."</a>";
      }
     
  }
  
  return $two."<a href='".$this->page_url."?page=1'>1</a>".$page_one.$page_echo.$page_two."<a href='".$this->page_url."?page=".$this->page_ys."'>".$this->page_ys."</a>".$three;

 }
 
 /*****************分页按钮 样式三  样式3大家可以写了。 *******************/
 
 function page_style_three(){
  return $this->page_style_two();
 }

}
?>

<style type="text/css教程">

a{ color:#fff; text-decoration:none; padding:2px 5px; background-color:#09C; border:#F63 double 1px; margin:0 2px; font-size:14px;}
a:hover{color:#f00; background-color:#CCC;}
body{color:#999;}
</style>
<?php

include 'p.php';                    //载入分页类库
         
$page=new Page('12345',"10");               //实例化类库     312  为显示的总条数     10   为每页显示的条数  

echo "样式二<br/>";
echo "<br/>";
echo "<br/>";
echo $page->page_fy('1');                //使用分页样式

echo "<br/>";echo "<br/>";echo "<br/>";echo "<br/>";

echo "样式一<br/>";
echo "<br/>";
echo "<br/>";
echo $page->page_fy();                    //使用分页样式

?>

<?php教程
error_reporting(0);
session_start();
//数据库教程连接
$conn = mysql教程_connect('localhost', 'root', '');
mysql_select_db('chenkun', $conn);
mysql_query('SET NAMES UTF-8');
//定义常量
define('ALL_PS', 'PHP');

function user_shell($uid, $shell, $m_id) {
    $sql = "select * from admin where uid='$uid'";
    $query = mysql_query($sql);
    $row = mysql_fetch_array($query);

    $shell = is_array($row) ? $shell == md5($row['username'] . $row['password'] . ALL_PS) : FALSE;
    if ($shell) {
        if ($row['m_id'] <= $m_id) {
            return $row;
        }
        echo "你的权限不足";
        exit ();
    } else {
        echo "你无权限访问该页";
        exit ();
    }
}

function user_mktime($onlinetime) {
    $new_time = mktime();
    if (($new_time - $onlinetime) > '900') {
        session_destroy();
        echo "登陆超时";
        exit ();
    } else {
        $_SESSION['times'] = mktime();
    }

}
?>