function.php

<?php
function dias_feriados( $year = null ){
	if( $year === null ){
		$year = intval( date( 'Y' ) );
	}

	/**
	 * easter_date() will generate a warning
	 * if the year is outside of the range
	 * for Unix timestamps (i.e. before 1970 or after 2037).
	 */
	$easter       = easter_date( $year );
	$easter_day   = date( 'j', $easter );
	$easter_month = date( 'n', $easter );
	$easter_year  = date( 'Y', $easter );
 
	$feriados = array(
		mktime( 0, 0, 0, 1,  1,   $year ), // Confraternização Universal
		mktime( 0, 0, 0, 4,  21,  $year ), // Tiradentes 
		mktime( 0, 0, 0, 5,  1,   $year ), // Dia do Trabalhador
		mktime( 0, 0, 0, 6,  12,  $year ), // Dia dos Namorados
		mktime( 0, 0, 0, 6,  24,  $year ), // Dia de São João
		mktime( 0, 0, 0, 9,  7,   $year ), // Dia da Independência
		mktime( 0, 0, 0, 10,  12, $year ), // N. S. Aparecida
		mktime( 0, 0, 0, 11,  2,  $year ), // Todos os santos
		mktime( 0, 0, 0, 11, 15,  $year ), // Proclamação da republica
		mktime( 0, 0, 0, 12, 25,  $year ), // Natal
 
		// These days have a date depending on easter
		mktime( 0, 0, 0, $easter_month, $easter_day - 48,  $easter_year ), //2ºferia Carnaval
		mktime( 0, 0, 0, $easter_month, $easter_day - 47,  $easter_year ), //3ºferia Carnaval	
		mktime( 0, 0, 0, $easter_month, $easter_day - 2 ,  $easter_year ), //6ºfeira Santa  
		mktime( 0, 0, 0, $easter_month, $easter_day     ,  $easter_year ), //Pascoa
		mktime( 0, 0, 0, $easter_month, $easter_day + 60,  $easter_year ), //Corpus Cirist
	);
 
	sort( $feriados );
	
	return $feriados;
}