~~~ //十进制转二进制，没8位用，分割 function tenTOtwo($str) { $res = ''; $i = 0; while($str != strval(0)) { $res = bcmod($str, '2').$res; $str = bcdiv($str, '2'); //echo $str.'<br/>'; $i = $i + 1; //echo '<br/>'; if($i >= 8) { $res = ','.$res; $i = 0; } } return $res; } ~~~