radio-wombat-toolkit/shortcodes/whatplaynow.php

<?php
/*

La funzione what_play_now funzione da per scontato che non ci siano trasmissioni con piu' di una diretta 
a settimana nello stesso giorno.

*/

function what_play_now($args)
{

    global $wpdb;
	/* Oggi espresso come $day (giorno della settimana 1-7 a partire da lunedì) e $now oggetto DateTime completo */
	$day = date("N");
	$now = new DateTime("NOW");
	$done = false;
	
	/* Cerco nelle dirette */

	/* Prendo dalla tabella wp_postmeta le tramissioni con diretta oggi e le repliche */
	$today_broadcast = $wpdb->get_results("
		SELECT post_id, meta_key FROM wp_postmeta WHERE (
			(meta_key BETWEEN 'on_air_day_0' AND 'on_air_day_6') OR  
			(meta_key BETWEEN 'rerun_day_0' AND 'rerun_day_6'))
			AND meta_value = '$day'
	");

	foreach($today_broadcast as $broadcast) {
		$broadcast = (array) $broadcast;
		$post_id = $broadcast['post_id'];
		/* Estraggo tutti i metadati del post e li metto in un array associativo $broadcast_data*/
		$meta_key_day = $broadcast['meta_key'];
		$meta_key = str_replace("day", "%", $meta_key_day);
		$meta_key = str_replace("_", "\\_", $meta_key);
		$metadata_query = $wpdb->get_results("
			SELECT meta_key, meta_value FROM wp_postmeta 
			WHERE post_id = '$post_id' 
			AND meta_key LIKE '$meta_key'
		");
		$broadcast_data = [];	
		foreach ($metadata_query as $meta) {
			$key_exploded = explode("_", $meta->meta_key);
			$key = $key_exploded[count($key_exploded) - 2];
			$broadcast_data[$key] = $meta->meta_value;			
		}
		$cadence_string = (isset($broadcast_data["cadence"])) ? $broadcast_data["cadence"] : "1"; 
		$startdate_string = (isset($broadcast_data["startdate"])) ? $broadcast_data["startdate"] : "";

		if (have_to_run_this_week($startdate_string,(int) $cadence_string)) {
			$start_timestring = $broadcast_data["start"];
			$end_timestring = $broadcast_data["end"];

			$start = new DateTime("$start_timestring");
			$end = new DateTime("$end_timestring");

			if ($now >= $start && $now <= $end) {
				$done = true;
				return get_post($post_id)->post_title;
				break;
			}
		}
	}
	
	if (!$done) {
		return "Selezione musicale";
	}
}

add_shortcode('whatplaynow', 'what_play_now');

?>