<?php

$input = "delta/india/juliet/lima
bravo/echo
bravo/foxtrot
charlie/hotel
delta/india/kilo
bravo/golf";

$dirs = explode("\n", $input);

$i = 999999;
$c = -1;
$m = -1;
$v = "";

foreach($dirs as $dir) {

    $dir = pathinfoex($dir);



    $m = substr_count  ($dir, "/");

    $dir = explode('/', $dir);
    $dir = $dir[count($dir) - 2];

    if($m == $c && $i > strlen($dir)) {
        $i = strlen($dir); $c = $m; $v = $dir;

    }

    if($m > $c) {
        $i = strlen($dir); $c = $m; $v = $dir;

    }
}

/*

    Números de "/" * 2 (..) + o números de / somado ao tamanho da pasta final

    Exemplo:
        ../../../../bruno = lengh 17

    $c = 4; (4 slashes)
    $i = 5; (bruno)

    (4 * 2) + 4 + 5 = 17

*/

echo $v."<br/>";

echo ((($c * 2) + $c) + $i);



function pathinfoex($d) {

    $a = explode('/', $d);
    $a = array_slice($a,0, -1);

    $a = implode('/', $a);

    return $a . "/";
}