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<?php
function ReShowInfo($str)
{
 $str = stripslashes($str);
 $str = str_replace("&lt;br /&gt;\r\n","<br />",htmlspecialchars(nl2br($str)));
 return $str;
}

function ReIptInfo($str)
{
 $str = stripslashes($str);
 $str = str_replace("&lt;br /&gt;","",htmlspecialchars(nl2br($str)));
 return $str;
}

if($_POST["operation"] == "post")
{
 echo ReShowInfo($_POST["t_content"]);
 $content2 = ReIptInfo($_POST["t_content"]);
}
?>
<form method="post" action="">
±êÌ⣺<input type="text" value="<?php echo ReShowInfo($_POST["t_content"]);?>"><br />
ÄÚÈÝ£º<textarea name="t_content" colspan=50 rowspan=50><?php echo $content2;?></textarea><br />
<input type="submit" value="Ìá½»">
<input type="hidden" name="operation" value="post">
</form>

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$str=addslashes($str);
$sql="insert into `tab` (`content`) values('$str')";
³ö¿âʱ
$str=stripslashes($str);
ÏÔʾʱ
$str=htmlspecialchars(nl2br($str)) ;