Merge pull request #483 from edent/patch-4

Update class-mf2.php to flatten the haystack

includes/Handler/class-mf2.php

@@ -589,6 +589,14 @@ public function compare_urls( $needle, $haystack, $schemeless = true ) {
 			$needle = array( $needle );
 		}
 
+		// Flatten the haystack to ensure it only contains strings
+		$haystack = array_filter(
+			$haystack,
+			function ( $element ) {
+				return is_string( $element ) && ! is_array( $element );
+			}
+		);
+
 		// Compare both arrays.
 		return array_intersect( $needle, $haystack );
 	}