code quality improvements

Code quality improvements at level 2 of PHPStan

phpstan.neon

@@ -2,3 +2,6 @@ parameters:
   reportUnmatchedIgnoredErrors: false
   ignoreErrors:
     - '#Call to an undefined static method Swoole\\Coroutine\\Socket::import\(\).#'
+    - '#Access to an undefined property Swoole\\Coroutine\\Socket::\$__ext_sockets_timeout.#'
+    - '#Access to an undefined property Swoole\\Coroutine\\Socket::\$__ext_sockets_nonblock.#'
+    - '#Access to an undefined property Swoole\\Coroutine\\Http\\ClientProxy::\$errCode.#'

src/core/Server/Admin.php

@@ -961,6 +961,7 @@ public static function handlerGetServerMemoryUsage($server, $msg)
         $total += $result['manager'];
 
         $n = $server->setting['worker_num'] + $server->setting['task_worker_num'];
+        /** @var int $n */
         for ($i = 0; $i < $n; $i++) {
             $key          = 'worker-' . $i;
             $result[$key] = self::getProcessMemoryRealUsage($server->getWorkerPid($i));
@@ -973,7 +974,7 @@ public static function handlerGetServerMemoryUsage($server, $msg)
         // TODO: Support other OS
         if (PHP_OS_FAMILY === 'Linux') {
             preg_match('#MemTotal:\s+(\d+) kB#i', file_get_contents('/proc/meminfo'), $match);
-            $result['memory_size'] = $match[1] * 1024;
+            $result['memory_size'] = intval($match[1]) * 1024;
         }
 
         return self::json($result);
@@ -997,6 +998,7 @@ public static function handlerGetServerCpuUsage($server, $msg)
         $total += $result['manager'][1] ?? 0;
 
         $n = $server->setting['worker_num'] + $server->setting['task_worker_num'];
+        /** @var int $n */
         for ($i = 0; $i < $n; $i++) {
             $key          = 'worker-' . $i;
             $result[$key] = self::getProcessCpuUsage($server->getWorkerPid($i))[1] ?? 0;