获取数组中每个元素的最后一个维度

Question

I have an array that might be any depth or number of elements:

$ra['a'] = 'one';
$ra['b']['two'] = 'b2';
$ra['c']['two']['three'] = 'c23';
$ra['c']['two']['four'] = 'c24';
$ra['c']['five']['a'] = 'c5a';

I want to have an array of the strings, like this:

array (
  0 => 'one',
  1 => 'b2',
  2 => 'c23',
  3 => 'c24',
  4 => 'c5a',
)

Here is a recursive function I made. It seems to work. But I'm not sure that I'm doing it right, as far as declaring the static, and when to unset the static var (in case I want to use the function again, I dont want that old static array)

function lastthinggetter($ra){
    static $out;
    foreach($ra as $r){
        if(is_array($r))
             lastthinggetter($r);
        else
            $out[] = $r;    
    }
    return $out;
}

How do I make sure each time I call the function, the $out var is fresh, every time? Is there a better way of doing this?

Maybe check if we're in recursion?

function lastthinggetter($ra, $recurse=false){
    static $out;
    foreach($ra as $r){
        if(is_array($r))
             lastthinggetter($r, true);
        else
            $out[] = $r;    
    }
    $tmp = $out;
    if(!$recurse)
        unset($out);
    return $tmp;
}

Answer 1

Your last version will probably work correctly. However, if you want to get rid of the static variable you could also do it like this:

function getleaves($ra) {
    $out=array();
    foreach($ra as $r) {
        if(is_array($r)) {
            $out=array_merge($out,getleaves($r));
        }
        else {
            $out[] = $r;
        }
    }
    return $out;
}

The key here is, that you actually return the so far found values at the end of your function but so far you have not 'picked them up' in the calling part of your script. This version works without any static variables.