递归函数：echo工作，返回不工作

The function aims at finding an item in a range of arrays, and then returning its key.

Problem is that the function doesn't return anything, whereas it would echo the expected result... Here is my code:

function listArray($tb, $target){
    foreach($tb as $key => $value){
        if(is_array($value)){ // current value is an array to explore
            $_SESSION['group'] = $key; // saving the key in case this array contains the searched item
            listArray($value, $target);
        }else {
            if ($target == $value) { // current value is the matching item
                return $_SESSION['group']; //Trying to return its key
                break; // I'd like to close foreach as I don't need it anymore
                }
        }
    }
}

By the way, an other little thing: I'm not used to recursive function, and I didn't find any other solution than using a session variable. But there might be a nicer way of doing it, as I don't use this session variable elsewhere...

I finally bypassed the problem by storing my result in a $_SESSION variable.

So, no return anymore...

$_SESSION['item'][$target] = $_SESSION['group'];

You need a return before the recurring listArray call.

Thank about it ..

return;
break;

That break is never reached (I don't believe you can use break to exit a function in php anyway)

The second return returns from a recursive call. Let's say that this was not two separate functions:

function foon() {
   barn();
}
function barn() {
   return true;
}

foon has no return statement.