'linkArr' =>
    array (size=2)
      'filename' =>
        array (size=2)
          0 => string 'f1' (length=2)
          1 => string 'f2' (length=2)
      'url' =>
        array (size=2)
          0 => string 'u1' (length=2)
          1 => string 'u2' (length=2)

array (size=2)
  0 =>
    array (size=2)
      'filename' => string 'f1' (length=2)
      'url' => string 'u1' (length=2)
  1 =>
    array (size=2)
      'filename' => string 'f2' (length=2)
      'url' => string 'u2' (length=2)

foreach ($startArray as $key1 => $value) {
    foreach ($value as $key2 => $value2) {
        foreach ($value2 as $key3 => $value3) {
            $endArray[$key3][$key2] = $value3;
        }
    }
}