mysqli::$protocol_version

(PHP 5, PHP 7)

Returns the version of the MySQL protocol used

int mysqli_get_proto_info ( mysqli $link )

Object oriented style

string $mysqli->protocol_version;

Procedural style

Returns an integer representing the MySQL protocol version used by the connection represented by the link parameter.

Parameters:

link

Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

Returns:

Returns an integer representing the protocol version.

Examples:

$mysqli->protocol_version example

Object oriented style

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

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* print protocol version */
printf("Protocol version: %d\n", $mysqli->protocol_version);

/* close connection */
$mysqli->close();
?>

Procedural style

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

/* check connection */
if (mysqli_connect_errno()) {
    printf("Connect failed: %s\n", mysqli_connect_error());
    exit();
}

/* print protocol version */
printf("Protocol version: %d\n", mysqli_get_proto_info($link));

/* close connection */
mysqli_close($link);
?>

The above examples will output:

Protocol version: 10