PHP sub-database and sub-table hash algorithm_PHP tutorial

Copy code The code is as follows:

//Sub-database and sub-table algorithm
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.htmlTechArticleCopy the code code as follows: //Sub-database and sub-table algorithm function calc_hash_db($u, $s = 4) { $h = sprintf("%u", crc32($u)); $h1 = intval(fmod($h, $s)); return $h1; } for($i=1;$i100;$i++) {...