Php implementation to check whether the email has been read

When you send an email, you may want to know whether the email has been read by the recipient. Here is a very interesting code snippet that shows the actual date and time when the recipient's IP address records are read.
Copy codeThe Code is as follows:
<?
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 );

?>