Custom post type loop with optional extra arguments

gistfile1.php

<?php 
  
	

function do_custom_pt_query( $args = array() ){
	
	global $post;
	
	$def_args = array('post_type' => 'on_air_programs',
		'numberposts' => -1,
		'posts_per_page' => -1,									
		'orderby' => 'meta_value_num',
		'order' => 'ASC');
	
	// Merge the defaults with defined parameters. You should be able to override the defaults be defining, say, 'orderby', when you call each function	
	$new_args = array_merge($def_args, $args);
	
	
	$the_query = get_posts( $new_args )
	
	if( is_array($the_query) && ( count($the_query) > 0 ) ){
		
		// Put in your loop container here, if any results
		
	}
	
	foreach( $the_query as $post ){
		
		setup_postdata( $post );
		
		// Do your loop here, treating it the same as main loop with $post object (i.e. the_title(), etc. should work)
		
		
	} // foreach
	
	
	if( is_array($the_query) && ( count($the_query) > 0 ) ){
		
		// Put in your loop container close tag(s) here, if any results
		
	}
	
	wp_reset_postdata();
	
	return $the_query; // Just in case you want to use the results
	
}


// Then all you have to do is call a function each time...?


do_custom_pt_query( array('days' => 'weekdays', 'meta_key' => 'eastern_weekday_times') );

do_custom_pt_query( array('days' => 'saturdays', 'meta_key' => 'saturdays') );

?>