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

Returns TRUE on success or FALSE on failure.

Example

Example 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();

?>

Example 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!