[exim] php + exim

i found a script on internet . The script is in php and used to send mails .
It works fine for me

$to = escapeshellcmd($to);
$from = escapeshellcmd($from);
$exim = popen('/path/to/exim -f ' . $from . ' ' . $to, 'w');
fwrite($exim, $message);
pclose($exim);


Here i can specify to and from field .
But , how can i add subject ,header fields to it ?



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