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x = 120; // 值域 100 < x < 200输出 100x = 560; // 值域: 500 < x <600输出 500x = 2360; // 值域: 2000 < x < 3000输出 2000x = 12345; // 值域: 10000 < x < 20000输出 10000x = ...
小伙看你根骨奇佳，潜力无限，来学PHP伐。
//格式化函数 function formatString($i){ return str_pad(substr("$i",0,1),strlen($i),'0',STR_PAD_RIGHT); } //测试调用 $result = array(); foreach(array(120,560,2360,12345) as $item){ $result[] = formatString($item); } //打印结果 print_r($result);
Array ( [0] => 100 [1] => 500 [2] => 2000 [3] => 10000 )
取最高位，后面按位数补零。
function hbit($x) { $length = ceil(log10($x)); $pid = str_pad(1,$length,'0',STR_PAD_RIGHT); return (($x/$pid)%$pid)*$pid; }
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
输出
Array ( [0] => 100 [1] => 500 [2] => 2000 [3] => 10000 )
取最高位，后面按位数补零。