Fix deprecations warnings on PHP 8.1

lib/Parser/MimeDir.php

@@ -518,7 +518,7 @@ protected function readProperty($line)
      *
      * Now for the parameters
      *
-     * If delimiter is not set (null) this method will just return a string.
+     * If delimiter is not set (empty string) this method will just return a string.
      * If it's a comma or a semi-colon the string will be split on those
      * characters, and always return an array.
      *

lib/Property.php

@@ -52,7 +52,7 @@ abstract class Property extends Node
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ';';
 

lib/Property/Binary.php

@@ -24,9 +24,9 @@ class Binary extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Updates the current value.

lib/Property/FloatValue.php

@@ -21,7 +21,7 @@ class FloatValue extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ';';
 

lib/Property/ICalendar/CalAddress.php

@@ -19,9 +19,9 @@ class CalAddress extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Property/ICalendar/Duration.php

@@ -22,7 +22,7 @@ class Duration extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ',';
 

lib/Property/ICalendar/Period.php

@@ -23,7 +23,7 @@ class Period extends Property
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
     public $delimiter = ',';
 

lib/Property/Time.php

@@ -19,9 +19,9 @@ class Time extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Property/Uri.php

@@ -20,9 +20,9 @@ class Uri extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Property/UtcOffset.php

@@ -17,9 +17,9 @@ class UtcOffset extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Property/VCard/DateAndOrTime.php

@@ -24,9 +24,9 @@ class DateAndOrTime extends Property
     /**
      * Field separator.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Property/VCard/TimeStamp.php

@@ -21,9 +21,9 @@ class TimeStamp extends Text
      * In case this is a multi-value property. This string will be used as a
      * delimiter.
      *
-     * @var string|null
+     * @var string
      */
-    public $delimiter = null;
+    public $delimiter = '';
 
     /**
      * Returns the type of value.

lib/Recur/EventIterator.php

@@ -198,6 +198,7 @@ public function __construct($input, $uid = null, DateTimeZone $timeZone = null)
      *
      * @return DateTimeImmutable
      */
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if ($this->currentDate) {
@@ -285,6 +286,7 @@ public function getEventObject()
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         // The counter is always 1 ahead.
@@ -297,6 +299,7 @@ public function key()
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if ($this->counter > Settings::$maxRecurrences && -1 !== Settings::$maxRecurrences) {
@@ -308,7 +311,10 @@ public function valid()
 
     /**
      * Sets the iterator back to the starting point.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->recurIterator->rewind();
@@ -331,7 +337,10 @@ public function rewind()
 
     /**
      * Advances the iterator with one step.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         $this->currentOverriddenEvent = null;

lib/Recur/RDateIterator.php

@@ -35,6 +35,7 @@ public function __construct($rrule, DateTimeInterface $start)
 
     /* Implementation of the Iterator interface {{{ */
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if (!$this->valid()) {
@@ -49,6 +50,7 @@ public function current()
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->counter;
@@ -60,14 +62,18 @@ public function key()
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return $this->counter <= count($this->dates);
     }
 
     /**
      * Resets the iterator.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->currentDate = clone $this->startDate;
@@ -76,7 +82,10 @@ public function rewind()
 
     /**
      * Goes on to the next iteration.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         ++$this->counter;

lib/Recur/RRuleIterator.php

@@ -38,6 +38,7 @@ public function __construct($rrule, DateTimeInterface $start)
 
     /* Implementation of the Iterator interface {{{ */
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if (!$this->valid()) {
@@ -52,6 +53,7 @@ public function current()
      *
      * @return int
      */
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->counter;
@@ -64,6 +66,7 @@ public function key()
      *
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         if (null === $this->currentDate) {
@@ -78,7 +81,10 @@ public function valid()
 
     /**
      * Resets the iterator.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->currentDate = clone $this->startDate;
@@ -87,7 +93,10 @@ public function rewind()
 
     /**
      * Goes on to the next iteration.
+     *
+     * @return void
      */
+    #[\ReturnTypeWillChange]
     public function next()
     {
         // Otherwise, we find the next event in the normal RRULE