PHP 负载均衡的多样性：了解不同技术的优缺点

$servers = array("server1", "server2", "server3");
$index = 0;
while (true) {
$server = $servers[$index];
// 处理请求
$index = ($index + 1) % count($servers);
}

$servers = array();
foreach ($servers as $server) {
$connections[$server] = 0;
}
while (true) {
$minConnections = INF;
foreach ($servers as $server) {
if ($connections[$server] < $minConnections) {
$minConnections = $connections[$server];
$server = $server;
}
}
// 处理请求
$connections[$server]++;
}

$servers = array();
foreach ($servers as $server) {
$responseTimes[$server] = 0;
}
while (true) {
$minResponseTime = INF;
foreach ($servers as $server) {
$responseTime = getResponseTime($server);
if ($responseTime < $minResponseTime) {
$minResponseTime = $responseTime;
$server = $server;
}
}
// 处理请求
$responseTimes[$server] += $requestTime;
}

$hash = hash("sha256", $requestId);
$index = $hash % count($servers);
$server = $servers[$index];
// 处理请求