Count Post in Category

Function.php:
/*
---------------------
Count Post in Category
---------------------
*/
function wt_get_category_count($input = '') {
	global $wpdb;
	if($input == '')
	{
		$category = get_the_category();
		return $category[0]->category_count;
	}
	elseif(is_numeric($input))
	{
		$SQL = "SELECT $wpdb->term_taxonomy.count FROM $wpdb->terms, $wpdb->term_taxonomy WHERE $wpdb->terms.term_id=$wpdb->term_taxonomy.term_id AND $wpdb->term_taxonomy.term_id=$input";
		return $wpdb->get_var($SQL);
	}
	else
	{
		$SQL = "SELECT $wpdb->term_taxonomy.count FROM $wpdb->terms, $wpdb->term_taxonomy WHERE $wpdb->terms.term_id=$wpdb->term_taxonomy.term_id AND $wpdb->terms.slug='$input'";
		return $wpdb->get_var($SQL);
	}
}



Tampilkan di category.php
<?php echo wt_get_category_count(); ?>