客户端循环读socket 数据时 耗时很长，谁能解答一下

while (!feof($socket)) {
    echo microtime(true) . "\n";
    $buffer = fgets($socket);
    var_dump($buffer);
    echo microtime(true)  . "\n\n";
    if ($buffer === '' || $buffer === false) {
        break;
    }
    $recvBuffer .= $buffer;
}