Home >Backend Development >PHP Tutorial >PHP sub-database and sub-table hash algorithm_PHP tutorial
PHP sub-database and sub-table hash algorithm_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:42:561462browse
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;
}
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：The difference between PHP single quotes and double quotes_PHP TutorialNext article：The difference between PHP single quotes and double quotes_PHP Tutorial