复制代码 代码如下:

//分库分表算法

function calc_hash_db($u, $s = 4)

{

$h = sprintf("%u", crc32($u));

$h1 = intval(fmod($h, $s));

return $h1;

}

for($i=1;$i<100;$i++)

{

echo calc_hash_db($i);

echo "<br>";

}

function calc_hash_tbl($u, $n = 256, $m = 16)

{

$h = sprintf("%u", crc32($u));

$h1 = intval($h / $n);

$h2 = $h1 % $n;

$h3 = base_convert($h2, 10, $m);

$h4 = sprintf("%02s", $h3);

return $h4;

}