Returns the version of the MySQL protocol used

# mysqli::$protocol_version

# mysqli_get_proto_info

(PHP 5, PHP 7, PHP 8)

mysqli::$protocol_version -- mysqli_get_proto_info — Returns the version of the MySQL protocol used

### Description

Object-oriented style

int $mysqli->protocol_version;

Procedural style

mysqli_get_proto_info(mysqli `$mysql`): int

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

### Parameters

`mysql`

  Procedural style only: A mysqli object returned by mysqli_connect() or mysqli_init()

### Return Values

Returns an integer representing the protocol version.

### Examples

Example #1 $mysqli->protocol_version example

Object-oriented style

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password");
/* print protocol version */
printf("Protocol version: %d\n", $mysqli->protocol_version);`

Procedural style

`<?php
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password");
/* print protocol version */
printf("Protocol version: %d\n", mysqli_get_proto_info($link));`

The above examples will output:

    Protocol version: 10

### See Also

- mysqli_get_host_info() - Returns a string representing the type of connection used

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