PHP 手冊
上一頁 |  | 下一頁

# mysqli_ping

(PHP 5)

mysqli_ping

(no version information, might be only in CVS)

mysqli->ping -- Pings a server connection, or tries to reconnect if the connection has gone down.

## Description

Procedural style:

bool mysqli_ping ( object link)

Object oriented style (method):

class mysqli {
bool ping ( void )
}

Checks whether the connection to the server is working. If it has gone down, and global option mysqli.reconnect is enabled an automatic reconnection is attempted.

This function can be used by clients that remain idle for a long while, to check whether the server has closed the connection and reconnect if necessary.

## Return values

成功回傳`TRUE`失敗回傳`FALSE`。

## Example

示範 1.Object oriented style
`<?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } /* check if server is alive */ if ($mysqli->ping()) { printf ("Our connection is ok!\n"); } else { printf ("Error: %s\n", $mysqli->error); } /* close connection */ $mysqli->close(); ?>`

示範 2.Procedural style
`<?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } /* check if server is alive */ if (mysqli_ping($link)) { printf ("Our connection is ok!\n"); } else { printf ("Error: %s\n", mysqli_error($link)); } /* close connection */ mysqli_close($link); ?>`

The above examples would produce the following output:

    Our connection is ok!

上一頁 | 最開頭 | 下一頁
mysqli_param_count | 上一層 | mysqli_prepare