Allow for trailing ; in RRULE (#307)

src/ICal/ICal.php

@@ -1304,7 +1304,7 @@ protected function processRecurrences()
 
             // Separate the RRULE stanzas, and explode the values that are lists.
             $rrules = array();
-            foreach (explode(';', $anEvent['RRULE']) as $s) {
+            foreach (array_filter(explode(';', $anEvent['RRULE'])) as $s) {
                 list($k, $v) = explode('=', $s);
                 if (in_array($k, array('BYSETPOS', 'BYDAY', 'BYMONTHDAY', 'BYMONTH', 'BYYEARDAY', 'BYWEEKNO'))) {
                     $rrules[$k] = explode(',', $v);

tests/rfc5545RecurrenceExamplesTest.php

@@ -5,7 +5,7 @@
 
 /**
  * The following tests are based on the event recurrence examples given
- * in the RFC5545 iCal specification (https://tools.ietf.org/html/rfc5545,
+ * in the RFC5545 iCal specification (https://datatracker.ietf.org/doc/html/rfc5545,
  * pages 123 to 132).
  *
  * Whilst this might not catch edge-cases, it does give a basic set of
@@ -101,6 +101,25 @@ public function test_page123_test2()
         );
     }
 
+    // Page 123, Test 3 :: Daily, until December 24th, with trailing semicolon
+    public function test_page123_test3()
+    {
+        $checks = array(
+            array('index' => 0, 'dateString' => '19970902T090000', 'message' => '1st occurrence: '),
+            array('index' => 1, 'dateString' => '19970903T090000', 'message' => '2nd occurrence: '),
+            array('index' => 2, 'dateString' => '19970904T090000', 'message' => '3rd occurrence: '),
+        );
+        $this->assertVEVENT(
+            'America/New_York',
+            array(
+                'DTSTART;TZID=America/New_York:19970902T090000',
+                'RRULE:FREQ=DAILY;UNTIL=19971224T000000Z;',
+            ),
+            113,
+            $checks
+        );
+    }
+
     // Page 124, Test 1 :: Daily, every other day, Forever
     //
     // UNTIL rule does not exist in original example