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<?php// http://pl.wikipedia.org/wiki/Dzielnik#Cechy_podzielno.C5.9Bcifunction Division11Simple($iInteger){  return (bool)($iInteger%11 == 0);}function Division11Advenced($iInteger){  $aNumbers = str_split((string)$iInteger);  $iEven = 0;  $iOdds = 0;    foreach($aNumbers as $iPlace => $iNumber)  {    $iNumber = (int)$iNumber;        if($iPlace%2 == 0)      $iEven += $iNumber;    else      $iOdds += $iNumber;  }    return (bool)(($iEven - $iOdds)%11 == 0);}var_dump( Division11Simple(121) );var_dump( Division11Advenced(121) );?>