Brazilian holidays wordpress php class

brazilian_holidays.php

<?php

/**
 * Based on
 * https://www.php.net/manual/pt_BR/function.easter-date.php#96686
 */

class BrazilHolidays {

	/**
	 * Get date (unix format) of all holidays of the year
	 *
	 * @param int|null $year
	 *
	 * @return array
	 */
	public static function get( int $year = null ): array {
		if ( is_null( $year ) ) {
			$year = intval( current_time( 'Y' ) );
		}

		$easter       = easter_date( $year );
		$easter_day   = (int) date( 'j', $easter );
		$easter_month = (int) date( 'n', $easter );
		$easter_year  = (int) date( 'Y', $easter );

		$holidays = [
			/** Fixed holidays */
			// Confraternização Universal
			mktime( 0, 0, 0, 1, 1, $year ),
			// Tiradentes
			mktime( 0, 0, 0, 4, 21, $year ),
			// Dia do Trabalhador
			mktime( 0, 0, 0, 5, 1, $year ),
			// Dia da Independência
			mktime( 0, 0, 0, 9, 7, $year ),
			// N. S. Aparecida
			mktime( 0, 0, 0, 10, 12, $year ),
			// Todos os santos
			mktime( 0, 0, 0, 11, 2, $year ),
			// Proclamação da república
			mktime( 0, 0, 0, 11, 15, $year ),
			// Natal
			mktime( 0, 0, 0, 12, 25, $year ),

			/** Holidays that depend on Easter */
			//Segunda feria de carnaval
			mktime( 0, 0, 0, $easter_month, $easter_day - 48, $easter_year ),
			//Terça feria de carnaval
			mktime( 0, 0, 0, $easter_month, $easter_day - 47, $easter_year ),
			//Sexta feira santa
			mktime( 0, 0, 0, $easter_month, $easter_day - 2, $easter_year ),
			//Páscoa
			mktime( 0, 0, 0, $easter_month, $easter_day, $easter_year ),
			//Corpus Cristi
			mktime( 0, 0, 0, $easter_month, $easter_day + 60, $easter_year ),

		];

		sort( $holidays );

		return $holidays;
	}
}