php – 在32位系统上将64位整数十六进制字符串转换为64位十进制

首先拆分输入字符串以获得高字节和低字节,然后将其转换为十进制,然后通过BC函数进行计算,如下所示：

$input = "0C80000000000063";

$str_high = substr($input,8);
$str_low = substr($input,8,8);

$dec_high = hexdec($str_high);
$dec_low  = hexdec($str_low);

//workaround for argument 0x100000000
$temp = bcmul ($dec_high,0xffffffff);
$temp2 = bcadd ($temp,$dec_high);

$result = bcadd ($temp2,$dec_low);

echo $result;

/*
900719925474099299
*/