动态检查PHP数组中的字符串

Question

EDIT: ten months later, I'm still back to this.. still can't figure it out :(

I can search for a string in an array no problem; this works:

if (in_array('animals', $value[tags])){
   echo "yes";
}

But how can I check for a variable in the array? This doesn't seem to work:

$page_tag = 'animals';
if (in_array($page_tag, $value[tags])){
   echo "yes";
}

I'm guessing I'm missing some simple syntax doodad?

The array is massive, so I'll try and show a sample of it. It is stored on a separate php file and "included" in other places.

global $GAMES_REPOSITORY;
$GAMES_REPOSITORY = array   (
     "Kitten Maker"      => array   (
        "num"   => "161",
        "alt"   => "Kitten Maker animal game",
        "title" => "Create the kitten or cub of your dreams!",
        "tags"  => array ("animals", "feline", "cats", "mega hits"),
     ),
}

Here's a larger part of the code, to put into context. It pulls from the array of ~400 games, and pulls the ones with a specific tag:

function array_subset($arr) {
    $newArray = array();
    foreach($arr as $key => $value) {
        if (in_array($page_tag, $value["tags"])){
            if(is_array($value)) $newArray[$key] = array_copy($value);
            else if(is_object($value)) $newArray[$key] = clone $value;
            else $newArray[$key] = $value;
        }
    }
    return $newArray;
}
function array_copy($arr) {
    $newArray = array();
    foreach($arr as $key => $value) {
        if(is_array($value)) $newArray[$key] = array_copy($value);
        else if(is_object($value)) $newArray[$key] = clone $value;
        else $newArray[$key] = $value;
    }
    return $newArray;
}
$games_list = array();
$games_list = array_subset($GAMES_REPOSITORY);
$games_list = array_reverse($games_list);

Oh, an interesting hint. Elsewhere it DOES work using $_GET:

if (in_array($_GET[tagged], $value[tags])){

Answer 1

I finally got it to work! I don't entirely understand why, but I had to feed the variable into the function directly. For some reason it wouldn't pull the variable from the parent function. But now it works and it even takes two dynamic variables:

function array_subset2($arr, $tag1, $tag2) {
    $newArray = array();
    foreach($arr as $key => $value) {
        if (in_array($tag1, $value['tags'])){
            if (in_array($tag2, $value['tags'])){
                if(is_array($value)) $newArray[$key] = array_copy2($value);
                else if(is_object($value)) $newArray[$key] = clone $value;
                else $newArray[$key] = $value;
            }
        }
    }
    return $newArray;
}
function array_copy2($arr) {
    $newArray = array();
    foreach($arr as $key => $value) {
        if(is_array($value)) $newArray[$key] = array_copy2($value);
        else if(is_object($value)) $newArray[$key] = clone $value;
        else $newArray[$key] = $value;
    }
    return $newArray;
}
$games_list = array();
$games_list = array_subset2($GAMES_REPOSITORY, $page_tag, $featured_secondary_tag);