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<?php
/* base function */
function user_is( $role ){
	$user = wp_get_current_user();
	if( ! $user ){
		return false;
	}

	return( in_array( $role, $user->roles ) );
}
/* commodities */
function is_administrator(){ return user_is( 'administrator' ); }
function is_editor(){ return user_is( 'editor' ); }