You can do it, dont wast your time tying.

You can mix PHP with Client Side.

What you need to do is like so:

Code: 
<iframe id="iframeID" src="http://google.com"></iframe>
<div id="some_content"></div>
<script>
$('#iframeID').bind('load',function(){
    //Do an ajax call
    $.get('data.php',function(data){
        $('#some_content').html(data);
    });
})
</script>
then in your data.php script echo some content.