变量中的变量？

Hi guys i am trying to use a variable in a variable (i don't know how to explain it :P) anyways i've tried everything so basically i want $gg (youtube video id) added to to a link please help me out

foreach ($searchResponse['items'] as $searchResult) {
  switch ($searchResult['id']['kind']) {
    case 'youtube#video':
      $videos .= sprintf('<dl>%s %s</dl>', $searchResult [''],
        $searchResult['videoId']."<iframe style='width:100%;height:99px;border:0;overflow:hidden' scrolling='no' align='middle' src=".$stream."&color=00e464> scrolling='no'></iframe>");
        $gg = $searchResult->id->videoId;
        $json = file_get_contents('http://www.youtubeinmp3.com/fetch/?format=JSON&video=http://www.youtube.com/watch?v='.$gg.'');
        $data = json_decode($json,true);
        $stream = $data['link'];
      break;

   }
}

EDIT: its kinda working!

but still some things are going wrong when i create $gg

$gg = $searchResult['id']['videoId'];

this is called concatenation and your mostly right:

$json = file_get_contents('http://www.youtubeinmp3.com/fetch/?format=JSON&video=http://www.youtube.com/watch?v='.$gg);

If I get your question correct, what you are trying to do is this: $variable = "Hello ".$another_variable;

This is one of the most basic things you learn at the beginning of php.

$w = "World!";
$h = "Hello ".$w;
echo $h;
/*
 * This will result printing out "Hello World";
 * The reason for this is because $w is a "Container",
 * that means the variable is keeping some information in it, basicly: it exists.
 * Now you can also use this in functions:
 */
function some_function($full_string){
    return $full_string;
}
echo some_function($h." What a good day!"); Which will result in "Hello World! What a good day!"
// I hope this was what you was looking for!