iFrame只需要一个网址 - 参数可以嵌入到网址中。

iFrames just take a url - and parameters can be embedded in urls just fine.

问题，如果我清楚地理解了这个问题，就是你在混淆你的报价：

The problem, if I understand the question clearly, is that you're mixing up your quotes:

 echo "<iframe src='sitename.com.au/directory/app/pagename.cfm?memberid='$val'
        width='100%' scrolling='vertical'></iframe>";

将输出为

 <iframe src='sitename.com.au/directory/app/pagename.cfm?memberid=' 21254545' 
  width='100%' scrolling='vertical'></iframe>

其中21254545是iframe的一个属性，而不是url的一部分。

where 21254545 is an attribute of the iframe instead of part of the url.

假设您实际上不需要网址中的引号，请将回显线更改为：

Assuming that you don't actually need the quotes in the url, change the echo line to:

echo "<iframe src='sitename.com.au/directory/app/pagename.cfm?memberid=$val' width='100%' scrolling='vertical'></iframe>";

它应该有效。