PHP mysqli: get_server_info() function
mysqli_get_server_info() function / mysqli::$server_info
The mysqli_get_server_info() function / mysqli::$server_info returns the MySQL server version.
Syntax:
Object oriented style
string $mysqli->server_info;
Procedural style
string mysqli_get_server_info ( mysqli $link )
Parameter:
Name | Required/Optional | Description |
---|---|---|
connection | Required for procedural style only and Optional for Object oriented style | A link identifier returned by mysqli_connect() or mysqli_init() |
Usage:
mysqli_get_proto_info(connection);
Parameter:
Name | Required/Optional | Description |
---|---|---|
connection | Required | Specifies the MySQL connection to use. |
Return value:
A character string representing the server version.
Version: PHP 5, PHP 7
Example of object oriented style:
<?php
$mysqli = new mysqli("localhost", "user1", "datasoft123");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* print server version */
printf("Server version: %s\n", $mysqli->server_info);
/* close connection */
$mysqli->close();
?>
Output:
Server version: 5.1.36-community-log
Example of procedural style:
<?php
$link = mysqli_connect("localhost", "user1", "datasoft123");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* print server version */
printf("Server version: %s\n", mysqli_get_server_info($link));
/* close connection */
mysqli_close($link);
?>
Output:
Server version: 4.1.2-alpha-debug
Example:
<?php
$con=mysqli_connect("localhost","user1","datasoft123","hr");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
echo mysqli_get_server_info($con);
mysqli_close($con);
?>
Output:
5.1.36-community-log
See also
Previous: protocol_version
Next: server_version
PHP: Tips of the Day
Getting all defined constants
To get all defined constants including those created by PHP use the get_defined_constants function:
Example:
<?php $constants = get_defined_constants(); var_dump($constants); // pretty large list
Output:
array(2250) { ["E_ERROR"]=> int(1) ["E_RECOVERABLE_ERROR"]=> int(4096) ["E_WARNING"]=> ..... ..... resource(1) of type (stream) ["STDOUT"]=> resource(2) of type (stream) ["STDERR"]=> resource(3) of type (stream) }
To get only those constants that were defined by your app call the function at the beginning and at the end of your script (normally after the bootstrap process):
<?php $constants = get_defined_constants(); define("HELLO", "hello"); define("WORLD", "world"); $new_constants = get_defined_constants(); $myconstants = array_diff_assoc($new_constants, $constants); var_export($myconstants);
Output:
array ( 'HELLO' => 'hello', 'WORLD' => 'world', )
It's sometimes useful for debugging
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