code: public function getRelativePath(string $path): string
      {
          $from = $this->path;
  
          $fromParts = explode("/", $from);
          $toParts = explode("/", $path);
          $max = max(count($fromParts), count($toParts));
          for ($i=0; $i<$max; $i++) {
              if (
                  !isset($fromParts[$i]) ||
                  !isset($toParts[$i]) ||
                  $fromParts[$i] !== $toParts[$i]
              ) {
                  break;
              }
          }
  
          $len = count($fromParts) - $i - 1;
          $path = array_slice($toParts, $i);
          if ($len < 0) {
              return implode("/", $path);
          }
  
          return str_repeat("../", $len).implode("/", $path);
      }
docs: Get the relative path from the current path to another
  
  @param string $path
  @return string