GetStableHash (The same algorithm with what MMORPG KIT does)

gistfile1.txt

<?php
function getUncheckedInt32($r) {
    $r = $r & 0xFFFFFFFF;
    if ($r & 0x80000000)
    {
        $r = $r & ~0x80000000;
        $r = -2147483648 + $r;
    }
    return $r;
}

function getStableHash($str) {
    $id = str_split($str);
    $hash1 = (int)5381;
    $hash2 = $hash1;
    $len = count($id);
    $end = 0;
    for ($i = 0; $i < $len && ord($id[$i]) != $end; $i += 2)
    {
        $char = ord($id[$i]);
        $hash1 = getUncheckedInt32(getUncheckedInt32(getUncheckedInt32($hash1 << 5) + $hash1) ^ $char);
        $char = ord($id[$i + 1]);
        if ($i == $len - 1 || $char == $end)
            break;
        $hash2 = getUncheckedInt32(getUncheckedInt32(getUncheckedInt32($hash2 << 5) + $hash2) ^ $char);
    }

    return getUncheckedInt32($hash1 + getUncheckedInt32($hash2 * 1566083941));
}