缓存的普通hash和一致性hash的算法

memcache-hash.php

<?php

// 整数hash
function intHash($key)
{
    $md5 = substr(md5($key), 0, 8);
    $seed = 31;
    $hash = 0;
    for ($i = 0;$i < 8; ++$i) {
        $hash = $hash * $seed + ord(md5($i));
        ++$i;
    }

    return $hash & 0x7FFFFFFF;
}

$value = intHash('wangchuang') % 2;
echo $value;