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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
DescriptionProcedural style: bool mysqli_ping ( mysqli 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.
返回值如果成功则返回 TRUE，失败则返回 FALSE。 例例子 1. Object oriented style |
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if ($mysqli->ping()) {
printf ("Our connection is ok!\n");
} else {
printf ("Error: %s\n", $mysqli->error);
}
$mysqli->close();
?>
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例子 2. Procedural style |
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
if (mysqli_ping($link)) {
printf ("Our connection is ok!\n");
} else {
printf ("Error: %s\n", mysqli_error($link));
}
mysqli_close($link);
?>
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上例将输出：
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mysqli_param_count