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# mysqli_change_user

(PHP 5)

mysqli_change_user

(no version information, might be only in CVS)

mysqli->change_user -- Changes the user of the specified database connection

## Description

Procedural style:

bool mysqli_change_user ( object link, string user, string password, string database)

Object oriented style (method):

class mysqli {
bool change_user ( string user, string password, string database)
}

mysqli_change_user() is used to change the user of the specified database connection as given by the `link` parameter and to set the current database to that specified by the `database` parameter.

If desired, the `NULL` value may be passed in place of the `database` parameter resulting in only changing the user and not selecting a database. To select a database in this case use the mysqli_select_db() function.

In order to successfully change users a valid `username` and `password` parameters must be provided and that user must have sufficient permissions to access the desired database. If for any reason authorization fails, the current user authentication will remain.

> 참고: Using this command will always cause the current database connection to behave as if was a completely new database connection, regardless of if the operation was completed successfully. This reset includes performing a rollback on any active transactions, closing all temporary tables, and unlocking all locked tables.

## Return Values

성공일 경우 `TRUE`를, 실패일 경우 `FALSE`를 반환합니다.

## See also:

mysqli_connect() mysqli_select_db()

## Example

예 1. Object oriented style

`<?php
/* connect database test */
$mysqli = new mysqli("localhost", "my_user", "my_password", "test");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
$mysqli->query("SET @a:=1");
/* reset all and select a new database */
$mysqli->change_user("my_user", "my_password", "world");
if ($result = $mysqli->query("SELECT DATABASE()")) {
$row = $result->fetch_row();
printf("Default database: %s\n", $row[0]);
$result->close();
}
if ($result = $mysqli->query("SELECT @a")) {
$row = $result->fetch_row();
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
$result->close();
}
/* close connection */
$mysqli->close();
?>`

예 2. Procedural style

`<?php
/* connect database test */
$link = mysqli_connect("localhost", "my_user", "my_password", "test");
/* check connection */
if (!$link) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Set Variable a */
mysqli_query($link, "SET @a:=1");
/* reset all and select a new database */
mysqli_change_user($link, "my_user", "my_password", "world");
if ($result = mysqli_query($link, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database: %s\n", $row[0]);
mysqli_free_result($result);
}
if ($result = mysqli_query($link, "SELECT @a")) {
$row = mysqli_fetch_row($result);
if ($row[0] === NULL) {
printf("Value of variable a is NULL\n");
}
mysqli_free_result($result);
}
/* close connection */
mysqli_close($link);
?>`

The above examples would produce the following output:

    Default database: world
    Value of variable a is NULL

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