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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。
<div class="codetitle"><a style="CURSOR: pointer" data="67744" class="copybut" id="copybut67744" onclick="doCopy('code67744')"> 代码如下:<div class="codebody" id="code67744">
<?
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 . ' ' . $browser . ' ' . "rn";
fwrite($fh,$stringData);
fclose($fh); //Generate Image (Es. dimesion is 1x1)
$newimage = ImageCreate(1,1);
$grigio = ImageColorAllocate($newimage,255,255);
ImageJPEG($newimage);
ImageDestroy($newimage); ?>
（编辑：李大同）
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