PHP 中的 mysqli ping函数

mysqli ping - 语法

bool mysqli_ping ( mysqli $link );

它用于ping服务器连接，并在连接丢失时重新连接到服务器。

mysqli ping - 返回值

成功时返回TRUE，失败时返回FALSE。

mysqli ping - 示例

<?php
   $connection_mysql=mysqli_connect("localhost","user","password","db");
   
   if (mysqli_connect_errno($connection_mysql)){
      echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   
   if (mysqli_ping($connection_mysql)){
      echo "Connection is ok!";
   }else{
      echo "Error: ". mysqli_error($connection_mysql);
   }
   mysqli_close($connection_mysql);
?>