php；查看邮件是否已被阅读

当你在发送邮件时，你或许很想知道该邮件是否被对方已阅读。这里有段非常有趣的代码片段能够显示对方IP地址记录阅读的实际日期和时间。 

 

 

 

<?  
error_reporting(0);  
Header("Content-Type: image/jpeg");  
   
//Get IP  
if (!empty($_SERVER['HTTP_CLIENT_IP']))  
{  
  $ip=$_SERVER['HTTP_CLIENT_IP'];  
}  
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))  
{  
  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];  
}  
else  
{  
  $ip=$_SERVER['REMOTE_ADDR'];  
}  
   
//Time  
$actual_time = time();  
$actual_day = date('Y.m.d', $actual_time);  
$actual_day_chart = date('d/m/y', $actual_time);  
$actual_hour = date('H:i:s', $actual_time);  
   
//GET Browser  
$browser = $_SERVER['HTTP_USER_AGENT'];  
       
//LOG  
$myFile = "log.txt";  
$fh = fopen($myFile, 'a+');  
$stringData = $actual_day . ' ' . $actual_hour . ' ' . $ip . ' ' . $browser . ' ' . "\r\n";  
fwrite($fh, $stringData);  
fclose($fh);  
   
//Generate Image (Es. dimesion is 1x1)  
$newimage = ImageCreate(1,1);  
$grigio = ImageColorAllocate($newimage,255,255,255);  
ImageJPEG($newimage);  
ImageDestroy($newimage);  
       
?>