求助 关于php 获取$_POST数据带http链接的问题

<?php
$str1= @$_POST[str1];
//$str2= @htmlentities($_POST[str2]);
$str2= @$_POST[str2];
?>
<title>$_POST demo</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<table width="100%" cellpadding="2" cellspacing="2">
  <tr>
      <td valign="top" align="left">
        <form method="post">
            <h3>字符串:</h3>
            <input type="text" name="str1" value="hello " />
            <input type="text" name="str2" value="<a href='http://bbs.bccn.net/'>bccn</a>" />
            <input type="submit" value="提交">
        </form>
    </td>
               
    <td valign="top" align="left">
    <h3>结果:</h3>
        <textarea name="content" id="Content" rows="20" cols="100"><?php
        echo $str2;
        echo ("\r");
        ?></textarea>
    </td>
  </tr>
</table>

<a href=\'http://bbs.bccn.net/\'>bccn</a>