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// REMOVE THE WORDPRESS UPDATE NOTIFICATION FOR ALL USERS EXCEPT SYSADMIN

global $user_login;

get_currentuserinfo();

if (!current_user_can('update_plugins')) { // checks to see if current user can update plugins 

    add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );

    add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );

}