~~~
function extract_binary($input) {
//數字轉二進制字符串
$string = decbin($input);
//翻轉字符串
$string = strrev($string);
//字符串拆成數組
$values = str_split($string);
//過濾掉數組中的0，只剩下1，元素索引不變
$values = array_filter($values, function($value) {
return $value;
});
//把剩下索引取出
$keys = array_keys($values);
//索引是幾，就是2的幾次方
$segments = [];
foreach ($keys as $k) {
$segments[] = pow(2, $k);
}
return $segments;
}
$value = 1+2+8+32+128+512;
$values = extract_binary($value);
var_dump($values);
~~~
