2,"0"=>8,"0x"=>16);    $remainderArr = array(10=>'a', 11=>'b', 12=>"c", 13=>'d', 14=>"e", 15=>"f");    $remainderArr_rev = array_flip($remainderArr);    if(!in_array($decimal, $arr)){        return ;    }        $newData = (string)$data;    //强制转化为字符串    $num = 0;    $len = strlen($newData);    for($i=0;$i<$len;$i++){        if($decimal == 16 && in_array($newData[$i], $remainderArr)){            $num += $remainderArr_rev[$newData[$i]]*pow($decimal,$len-$i-1);        }else{            $num += $newData[$i]*pow($decimal,$len-$i-1);        }    }    return $num; } var_dump(tDecimal("101", 2));    //int(5) var_dump(tDecimal("07", 8));    //int(7)var_dump(tDecimal("1f", 16));    //int(31)