php-doc-en/reference/mysqli/functions/mysqli-change-user.xml

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  <refentry id="function.mysqli-change-user">
   <refnamediv>
    <refname>mysqli_change_user</refname>
    <refpurpose>Changes the user of the specified database connection</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>mysqli_change_user</methodname>
      <methodparam><type>resource</type><parameter>link</parameter></methodparam>
      <methodparam><type>string</type><parameter>user</parameter></methodparam>
      <methodparam><type>string</type><parameter>password</parameter></methodparam>
      <methodparam><type>string</type><parameter>database</parameter></methodparam>
     </methodsynopsis>
    <para>
    <function>mysqli_change_user</function> is used to change the user of the specified
    database connection as given by the <parameter>link</parameter> parameter and sets the 
    current database to that specified by the <parameter>database</parameter> parameter. 
    This function will return a boolean value indicating if the operation was successful 
    or not.
    </para>
    <para>
    If desired, the NULL value may be passed in place of the <parameter>database</parameter>
    parameter resulting in only changing the user and not selecting a database. To select
    a database in this case use the <function>mysqli_select_db</function> function.
    </para>
    <para>
    In order to successfully change users a valid <parameter>username</parameter> and
    <parameter>password</parameter> 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.
    </para>
    <note>
     <para>
     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.
     </para>
    </note>
   </refsect1>
  </refentry>

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