mysqli::ping

定义和用法

ping() / mysqli_ping() 函数用于 ping 服务器连接，以检查服务器是否存活。如果连接断开，它还会尝试重新连接。

实例

例子 1 - 面向对象风格

ping 服务器连接：

<?php
$mysqli = new mysqli("localhost","my_user","my_password","my_db");

// 检查连接
if ($mysqli -> connect_errno) {
  echo "Failed to connect to MySQL: " . $mysqli -> connect_error;
  exit();
}

// 检查服务器是否存活
if ($mysqli -> ping()) {
  echo "Connection is ok!";
} else {
  echo "Error: ". $mysqli -> error;
}

$mysqli -> close();
?>

例子 2 - 过程式风格

ping 服务器连接：

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");

// 检查连接
if (mysqli_connect_errno()) {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  exit();
}

// 检查服务器是否存活
if (mysqli_ping($con)) {
  echo "Connection is ok!";
} else {
  echo "Error: ". mysqli_error($con);
}

mysqli_close($con);
?>