解决PHP脚本pdo MySQL has gone away错误 pdo加ping功能

<?php
class NPDO {
  private $pdo;
  private $params;
  
  public function __construct() {
  
  $this->params = func_get_args();
  $this->init();
  }
  
  public function __call($name, array $args) {
  try {
  return call_user_func_array(array($this->pdo, $name), $args);
  } catch (PDOException $e) {
  }
  }
  
  public function ping() {
  try {
  $this->pdo->query('SELECT 1');
  $error=$this->pdo->errorInfo();//由于pdo扩展的bug，有时不抛出异常，这里要加上错误信息
  if ($error[2]=='MySQL server has gone away') {
  $this->init();
  }
  } catch (PDOException $e) {
  $this->init();
  }
  
  return true;
  }
  
  private function init() {
  try {
  $class = new ReflectionClass('PDO');
  $this->pdo = $class->newInstanceArgs($this->params);
  } catch (PDOException $e) {
  }
  
  }
  }
  $flysystempdo = new NPDO('mysql:dbname=test;host=localhost', 'root','root');
  $flysystempdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  while (true) {
  $flysystempdo->ping();
  $sql = 'SELECT 1';
  $aa=$flysystempdo->query($sql);
  var_dump($aa);
  sleep(1);
}

//另外2种

http://blog.csdn.net/fdipzone/article/details/53117541

http://blog.csdn.net/coprophet/article/details/18364641