Issue [#112] / apply is_countable() from native PHP 7.3+ or from Word…

…Press polyfill function to avert PHP warnings.

syndicatedpost.class.php

@@ -705,7 +705,7 @@ public function author () {
 		$author = array ();
 
 		$aa = $this->entry->get_authors();
-		if (count($aa) > 0) :
+		if (is_countable($aa) and count($aa) > 0) :
 			$a = reset($aa);
 
 			$author = array(
@@ -903,7 +903,7 @@ function inline_tags () {
 		$content = $this->content();
 		$pattern = FeedWordPressHTML::tagWithAttributeRegex('a', 'rel', 'tag');
 		preg_match_all($pattern, $content, $refs, PREG_SET_ORDER);
-		if (count($refs) > 0) :
+		if (is_countable($refs) and count($refs) > 0) :
 			foreach ($refs as $ref) :
 				$tag = FeedWordPressHTML::tagWithAttributeMatch($ref);
 				$tags[] = $tag['content'];
@@ -1301,7 +1301,7 @@ function freshness ($format = 'number') {
 					// Or the hash...
 					$hash = $this->update_hash();
 					$seen = $this->stored_hashes($old_post->ID);
-					if (count($seen) > 0) :
+					if (is_countable($seen) and count($seen) > 0) :
 						$updated = !in_array($hash, $seen); // Not seen yet?
 					else :
 						$updated = true; // Can't find syndication meta-data