怎样输出包含html+php混合代码的字符串

下面是字符串的代码，希望好人帮忙看看，谢谢，
<?php !defined(*FRAMEWORK_PATH*) && exit(*Access Denied*);?>
<form action="" method="post" id="reg_form">
<input type="hidden" name="FORM_HASH" value="<?php echo FORM_HASH;?>" />
<input type="hidden" name="clienttime" value="" />
<dl>
<dt><label for="reg_email">Email：</label></dt>
<dd>
<input type="text" name="email" id="reg_email" value="<?php echo isset($user[*email*]) ? $user[*email*] : **;?>" tabindex="1" style="width: 250px;" /> <span id="reg_check_email">
<a href="" onclick="return false;" class="ajaxdialog">登录</a>
</span>
</dd>
<dt><label for="reg_username">用户名：</label></dt>
<dd>
<input type="text" name="username" id="reg_username" size="24" value="<?php echo isset($user[*username*]) ? $user[*username*] : **;?>" title="请输入用户名" tabindex="2" style="width: 250px;" />
<span id="reg_check_username"></span>
</dd>
<dt><label for="reg_password">密　码：</label></dt>
<dd>
<input type="password" name="password" id="reg_password" size="24" value="" title="请输入密码" tabindex="3" style="width: 250px;" />
</dd>
<dt><label for="reg_password2">重复密码：</label></dt>
<dd>
<input type="password" name="password2" id="reg_password2" size="24" value="" title="请输入密码" tabindex="4" style="width: 250px;" />
</dd>
<dt></dt>
<dd>
<input type="submit" class="button bigblue" id="reg_submit_ajax" value="注册" tabindex="5" />
<input type="button" class="button biggrey" value="关闭" id="create_cancel"/>
</dd>
</dl>
</form>
这个含有<?php ?> 符号，好像eval不行吧