php 分庫分表hash演算法_PHP教程

複製代碼 代碼如下:
//分庫分表演算法
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 "
";
}

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;
}

http://www.bkjia.com/PHPjc/320858.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/320858.htmlTechArticle複製代碼 代碼如下: //分庫分表演算法 function calc_hash_db($u, $s = 4) { $h = sprintf("%u", crc32($u)); $h1 = intval(fmod($h, $s)); return $h1; } for($i=1;$i100;$i++) {...

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