php实现记住密码自动登录

$start_time = microtime(true);

//一些需要计算时间的代码
//... code here ...

print('代码的运行时间是：'.getExecTime($start_time));

function getExecTime($start_time)
{
 return microtime(true)-$start_time;
}PEAR的Benchmark模块提供了更详细的时间统计功能

require_once 'Benchmark/Timer.php';
$timer =& new Benchmark_Timer(true);
$timer->start();
// 设置函数
$timer->setMarker('setup');
// some more code executed here
$timer->setMarker('middle');
// even yet still more code here
$timer->setmarker('done');
// and a last bit of code here
$timer->stop();
$timer->display();通过declare结构和ticks指令可以实现自动记录每一行PHP代码执行的时间

// A function that records the time when it is called
function profile($dump = FALSE)
{
    static $profile;

    // Return the times stored in profile, then erase it
    if ($dump) {
        $temp = $profile;
        unset($profile);
        return ($temp);
    }

    $profile[] = microtime();
}

// Set up a tick handler
register_tick_function("profile");

// Initialize the function before the declare block
profile();

// Run a block of code, throw a tick every 2nd statement
declare(ticks=2) {
    for ($x = 1; $x < 50; ++$x) {
        echo similar_text(md5($x), md5($x*$x)), ";";
    }
}

// Display the data stored in the profiler
print_r(profile (TRUE));注意：ticks 指令在 PHP 5.3.0 中是过时指令，将会从 PHP 6.0.0 移除。

<?php
/*----------------------------------------------------------------------------------
 *
 *----------------------------------------------------------------------------------
 */
class image_up{
 //定义基本参数
 private $uptype=array('image/jpg','image/jpeg','image/png','image/pjpeg','image/gif','image/bmp','image/x-png');  //上传文件类型
 private $max_file_size=102400;    //上传大小限制(单位:KB)
 private $destination_folder="up/"; //上传文件路径
 private $watermark=1;              //是否附加水印
 private $watertype=1;              //水印类型(1为文字,2为图片)
 private $waterposition=1;          //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
 private $waterstring=null;         //水印字符串
 private $waterimg=null;            //水印图片
 private $imgpreview=1;             //是否生成预览图(1为生成,其他为不生成);
 private $imgpreviewsize=1;         //预览图比例，0为按固定宽和高显示，其他为比例显示
 private $imgwidth=200;             //预览图固定宽度
 private $imgheight=200;            //预览图固定高度
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 private $imgthu=1;                     //是否生成且保存略缩图,1为生成，0为不生成
 private $imgthu_folder=null;           //略缩图保存路径,默认与文件路径一致
 private $imgthu_fixed=0;               //略缩图是否使用固定宽高，1为使用，0为灵活变动
 private $imgthu_width=200;             //略缩图宽度
 private $imgthu_height=200;            //略缩图高度
 
 private $imgthu_name=null;             //略缩图名称
 //******************************************************************************************************************
 private $inputname="upfile";       //文件上传框名称
 //******************************************************************************************************************
 private $img_preview_display;      //图片预览图显示
 //******************************************************************************************************************
 //文件上传相关信息，1为文件不存在，2为类型不符合，3为超出大小限制，4为上传失败，0为上传成功
 private $file_up_info=null;
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 //可在外部获取上传文件基本信息
 private $file_name;         //客服端文件的原名称
 private $file_type;         //文件的MIME类型
 private $file_size;         //已上传文件的大小，单位/字节
 private $file_tmp_name;     //储存的临时文件名
 private $file_error;        //该文件上传相关错误代码

 private $img_size;          //取得图片的长宽
 private $file_basename;     //获取带扩展名的全名
 private $file_extension;    //获取文件扩展名
 private $filename;          //文件名（不带扩展名)
 private $destination;       //问价路径加名称
 //******************************************************************************************************************
 public function __set($propety_name,$value){
  $this->$propety_name=$value;
 }
 public function __get($property_name){
  if(isset($this->$property_name))
  return($this->$property_name);
  else return(NULL);
 }
 //******************************************************************************************************************
 //定义文件上传功能
 public function up(){
  //判断文件是否存在
  if(!is_uploaded_file($_FILES[$this->inputname]["tmp_name"])){
   $this->file_up_info=1;
   return;
  }
  //获取并赋值相应基本参数
  $upfile=$_FILES[$this->inputname];
  $this->file_name=$upfile["name"];
  $this->file_type=$upfile["type"];
  $this->file_size=$upfile["size"];
  $this->file_tmp_name=$upfile["tmp_name"];
  $this->file_error=$upfile["error"];
  //检查文件类型是否符合
  if(!in_array($this->file_type,$this->uptype)){
   $this->file_up_info=2;
   return;
  }
  //检查文件大小是否超出限制
  if($this->file_size>$this->max_file_size){
   $this->file_up_info=3;
   return;
  }
  //判断目录是否存在
  if(!file_exists($this->destination_folder))
  mkdir($this->destination_folder);
  //进一步取得图片的信息并赋值
  $this->img_size=getimagesize($this->file_tmp_name);
  $pathinfo=pathinfo($this->file_name);
  $this->file_extension=$pathinfo["extension"];    //获取文件扩展名
  $this->file_basename=$pathinfo["basename"];      //获取带扩展名的全名
  $this->filename=$pathinfo["filename"];           //文件名（不带扩展名)
  $filename2=$pathinfo['filename'];
  $this->destination = $this->destination_folder.$this->filename.".".$this->file_extension;
  //判断文件名是否存在，如果存在则重命名
  $n=1;
  while (file_exists($this->destination)){
   while (file_exists($this->destination)){
    $n++;
    $this->filename=$this->filename."(".$n.")";
    $this->destination = $this->destination_folder.$this->filename.".".$this->file_extension;
   }
   $this->filename=$filename2."(".$n.")";
   $this->destination = $this->destination_folder.$this->filename.".".$this->file_extension;
  }
  //移动上传的文件
  if(move_uploaded_file($this->file_tmp_name,$this->destination))
  $this->file_up_info=0;
  else $this->file_up_info=4;
   
  //添加水印
  if($this->watermark==1){
   $this->imgthu();
  }
  //生成略缩图
  if($this->imgthu==1){
   $this->add_watermark();
  }
  //生成预览图
  if($this->imgpreviewsize == 0){
   if($this->img_size["0"]<$this->imgwidth) $this->imgwidth=$this->img_size["0"];
   if($this->img_size["1"]<$this->imgheight) $this->imgheight=$this->img_size["1"];
  }else{
   $this->imgwidth=$this->img_size["0"]*$this->imgpreviewsize;
   $this->imgheight=$this->img_size["1"]*$this->imgpreviewsize;
  }
  $this->img_preview_display="<img src='$this->destination' width='$this->imgwidth' height='$this->imgheight'
                                    alt='图片预览：r文件名'：$this->file_tmp_name />";
 }
//====================================================================================================================
//==================================================================================================================== 
 //生成略缩图功能
 function imgthu(){
  if($this->imgthu_folder==null)
    $this->imgthu_folder=$this->destination_folder;
  
  //$this->imgthu_name=$this->filename."_t.".$this->file_extension;
  $imgthu_name_b=$this->filename."_t";
  $imgthu_name_b2=$this->filename."_t";
  $destination_b=$this->imgthu_folder.$imgthu_name_b.".".$this->file_extension;
     //判断文件名是否存在，如果存在则重命名
  $n=1;
  while (file_exists($destination_b)){
   while (file_exists($destination_b)){
    $n++;
    $imgthu_name_b=$imgthu_name_b."(".$n.")";
    $destination_b = $this->imgthu_folder.$imgthu_name_b.".".$this->file_extension;
   }
   $imgthu_name_b=$imgthu_name_b2."(".$n.")";
   $destination_b = $this->imgthu_folder.$imgthu_name_b.".".$this->file_extension;
  }
  
  
  $imginfo=getimagesize($this->destination);
  switch($imginfo[2])
  {
   case 1:
    $in=@imagecreatefromgif($this->destination);
    break;
   case 2:
    $in=@imagecreatefromjpeg($this->destination);
    break;
   case 3:
    $in=@imagecreatefrompng($this->destination);
    break;
   case 6:
    $in =@imagecreatefrombmp($this->destination);
    break;
   default:
    break;
  }
  //计算略缩图长宽
  if($this->imgthu_fixed==0){
   if($this->imgthu_height>($imginfo[1]/$imginfo[0])*$this->imgthu_width)
    $this->imgthu_width = ($imginfo[0]/$imginfo[1])*$this->imgthu_height;
   else
    $this->imgthu_height=($imginfo[1]/$imginfo[0])*$this->imgthu_width;
  }
  $new = imageCreateTrueColor($this->imgthu_width,$this->imgthu_height);
  ImageCopyResized($new,$in,0,0,0,0,$this->imgthu_width,$this->imgthu_height,$imginfo[0],$imginfo[1]);
  switch ($imginfo[2])
  {
   case 1:
    imagejpeg($new,$destination_b);
    break;
   case 2:
    imagejpeg($new,$destination_b);
    break;
   case 3:
    imagepng($new,$destination_b);
    break;
   case 6:
    imagewbmp($new,$destination_b);
    break;
  }
 }
//====================================================================================================================
//==================================================================================================================== 
 //添加水印功能
 function add_watermark(){
  //1 = GIF，2 = JPG，3 = PNG，4 = SWF，5 = PSD，6 = BMP，7 = TIFF(intel byte order)，
  //8 = TIFF(motorola byte order)，9 = JPC，10 = JP2，11 = JPX，12 = JB2，13 = SWC，14 = IFF，15 = WBMP，16 = XBM。
  $imginfo=getimagesize($this->destination);
  $im=imagecreatetruecolor($this->img_size[0],$this->img_size[1]);       //创建真彩色
  $white=imagecolorallocate($im,255,255,255);                            //设置颜色
  $black=imagecolorallocate($im,0,0,0);
  $red=imagecolorallocate($im,255,0,0);
  //在 image 图像的坐标 x，y（图像左上角为 0, 0）处用 color 颜色执行区域填充（即与 x, y 点颜色相同且相邻的点都会被填充）。
  imagefill($im,0,0,$white);

  switch($imginfo[2])
  {
   case 1:
    $simage =imagecreatefromgif($this->destination);      // 创建一个新的形象，从文件或 URL
    break;
   case 2:
    $simage =imagecreatefromjpeg($this->destination);
    break;
   case 3:
    $simage =imagecreatefrompng($this->destination);
    break;
   case 6:
    $simage =imagecreatefromwbmp($this->destination);
    break;
   default:
    echo ("不支持的文件类型");
    break;
  }
  if(!empty($simage))
  {
   //位置设置
   if($this->watertype==1){
    $str_len=strlen($this->waterstring);
       $str_width=$str_len*10;
       $str_height=20;
   }elseif($this->watertype==1 && file_exists($this->waterimg)){
    $iinfo=getimagesize($this->waterimg);
    $str_width = $iinfo[0];
    $str_height = $iinfo[1];
   }
   
   switch ($this->waterposition){
    case 1:
     $p_x=5;
     $p_y=$this->img_size[1]-$str_height;
     break;
    case 2:
     $p_x=$this->img_size[0]-$str_width;
     $p_y=$this->img_size[1]-$str_height;
     break;
    case 3:
     $p_x=5;
     $p_y=0;
     break;
    case 4:
     $p_x=$this->img_size[0]-$str_width;
     $p_y=5;
     break;
    case 5:
     $p_x=($this->img_size[0]-$str_width)/2;
     $p_y=($this->img_size[1]-$str_height)/2;
     break;
   }
   imagecopy($im,$simage,0,0,0,0,$this->img_size[0],$this->img_size[1]);   //拷贝图像的一部分
   //imagefilledrectangle($im,1,$this->img_size[1]-15,130,$this->img_size[1],$white);  //将图片的封闭长方形区域着色

   switch($this->watertype)
   {
    case 1:   //加水印字符串
     imagestring($im,10,$p_x,$p_y,$this->waterstring,$red);
     break;
    case 2:   //加水印图片
     $simage1 =imagecreatefromgif($this->waterimg);
     imagecopy($im,$simage1,0,0,0,0,85,15);
     imagedestroy($simage1);
     break;
   }

   switch ($imginfo[2])
   {
    case 1:
     //imagegif($nimage, $destination);
     imagejpeg($im, $this->destination);
     break;
    case 2:
     imagejpeg($im, $this->destination);
     break;
    case 3:
     imagepng($im, $this->destination);
     break;
    case 6:
     imagewbmp($im, $this->destination);
     break;
   }
   //覆盖原上传文件
   imagedestroy($im);
   imagedestroy($simage);
  }
 }
}
?>

<?php
$url = "http://www.111cn.net/img/logo.jpg";
$filename = 'curl.gif';

getImg($url, $filename);
/*
*@通过curl方式获取制定的图片到本地
*@ 完整的图片地址
*@ 要存储的文件名
*/
function getImg($url = "", $filename = "") {
if(is_dir(basename($filename))) {
echo "The Dir was not exits";
Return false;
}
//去除URL连接上面可能的引号
$url = preg_replace( '/(?:^['"]+|['"/]+$)/', '', $url );
$hander = curl_init();
$fp = fopen($filename,'wb');
curl_setopt($hander,CURLOPT_URL,$url);
curl_setopt($hander,CURLOPT_FILE,$fp);
curl_setopt($hander,CURLOPT_HEADER,0);
curl_setopt($hander,CURLOPT_FOLLOWLOCATION,1);
//curl_setopt($hander,CURLOPT_RETURNTRANSFER,false);//以数据流的方式返回数据,当为false是直接显示出来
curl_setopt($hander,CURLOPT_TIMEOUT,60);
/*$options = array(
CURLOPT_URL=> 'http://www.111cn.net/img/logo.jpg',
CURLOPT_FILE => $fp,
CURLOPT_HEADER => 0,
CURLOPT_FOLLOWLOCATION => 1,
CURLOPT_TIMEOUT => 60
);
curl_setopt_array($hander, $options);
*/
curl_exec($hander);
curl_close($hander);
fclose($fp);
Return true;
}
?>

<?php
 require_once showErrMsg.php;
 $_action = (isset($_REQUEST[action])?$_REQUEST[action]:"");
 if($_action!=null&&$_action!=){
  if(function_exists($_action)){
   eval("$_action();");
  }else{
   die(showErrMsg ( "<br>当前php文件中不存在方法[<b>".$_action."()</b>]。"));
  }
 }
?>

<?php
function showErrMsg($strMsg){
  return "<font color=red>".$strMsg."</font>";
 }
?>

<?php
class A
{
      function foo()
      {
          if (isset($this)) {
              echo '$this is defined (';
              echo get_class($this);
              echo ")n";
          } else {
              echo "$this is not defined.n";
          }
      }
}

class B
{
      function bar()
      {
        A::foo();
         //parent::foo();
      }
}

$a = new A();
$a->foo();//动态调用，因为new了对象
A::foo();//静态调用，直接用类名去调用，没有new对象
$b = new B();
$b->bar();//在对象$b中，A::foo();进行静态调用
B::bar();
?>