我使用这个简单的脚本来检测网站内容的更改，并在发生更改时发送邮件。我已经设置了一个cron作业来每天运行脚本，它运行得很好，但当脚本检测到更改时，它会发送没有正文的空白电子邮件。为什么会发生这种事？我在这里（邮件部分）做错了什么吗？
<?php
$contents = file_get_contents('http://izoneknr.com');
$hash = file_get_contents('../heimdall/heimdall.txt');
if ($hash == ($pageHash = md5($contents)))
{
echo " the content is the same";
}
else
{
$from = "Heimdall";
$EmailTo = "smckannur@gmail.com,sourab.cc@gmail.com"; // Your email address here
$Subject = "WEBSITE MODIFICATION ALERT";
$headers.= "MIME-version: 1.0'n";
$headers.= "Content-type: text/html; charset=iso-8859-1'n";
$headers.= "From: $from'n";
$message = '<html><body>';
$message.= '<p>This is an automated response from mysite.The bridge is open.</p><br>';
$message.= '<p>m7mysite has been updated.</p>';
$message = '</body></html>';
$success = mail($EmailTo, $Subject, $message,$headers);
// store the new hash in the file
$fp = fopen('../heimdall/heimdall.txt', 'w');
fwrite($fp, $pageHash);
fclose($fp);
}
您正在用覆盖以前分配的内容
$message = '</body></html>';
更改为：
$message .= '</body></html>';