php发送邮件代码-用mail

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<?php
if (empty($from) or empty($subject) or empty($content)) {
echo "没有完成填写，请";
}
$body="[主题] $subjectn";
$body.="[发件人] $fromn";
$body.=$content;
$deal=mail("");
if ($deal) {echo "寄件成功！";}else{echo "寄件失败www.111com.net！！！";}
?>