Deprecated function filling up error log

We’re having the same issue, error log file over 1GB full of:

All-in-One Event Calendar: preg_match(): Passing null to parameter #4 ($flags) of type int is deprecated @ /wp-content/plugins/all-in-one-event-calendar/vendor/twig/Lexer.php

WP version – 6.4.3
All-in-One Event Calendar by Time.ly – version 3.0.1

• This reply was modified 1 year ago by barrycrous.

Hi @barrycrous

Thanks for reaching out!

To better assist you please fill out the following form here, and we will review your request.

Sincerely,
Yenmer.
Timely Customer Support.

We are experiencing the same issue – please advise the fix asap

For any others experiencing this issue here are some suggestions…

Offered with no warranty, please test in your own environment before implementation in production sites… YMMV (-:

With much gratitude to @leroyrosales and his forked 3.0.0 version at https://github.com/leroyrosales/all-in-one-event-calendar

To mitigate many of the Deprecation notices being generated in the version 3.0.1 of the plugin you will need to update a number of functions in two library scripts to include the #[\ReturnTypeWillChange] attribute.

See: https://www.php.net/manual/en/class.returntypewillchange.php

Also see this very detailed StackOverflow answer for more info and potentially more suggestions about resolving this issue permanently rather than simply supressing the deprecation notices:
https://stackoverflow.com/questions/71133749/reference-return-type-of-should-either-be-compatible-with-or-the-re

For example,

/**
 * @overload ArrayAccess::offsetGet()
 */
#[\ReturnTypeWillChange]
public function offsetGet( $offset ) {
    return $this->get_scalar( $offset );
}

Change \lib\http\request\abstract.php to update these functions
public function offsetGet
public function offsetSet
public function offsetUnset

Change lib\iCal\helper\SG_iCal_Line.php to update these functions
public function offsetExists
public function offsetGet
public function offsetSet
public function offsetUnset
public function count
public function getIterator

More updates regarding 8.x support. I have found there are a number of patches that need to be made in upstream libraries included in the ai1ec plugin. The included versions of libraries for the ics/ical parsing as well as twig are older and integration of the newer PHP 8.x stable versions is likely quite an endeavor. It may be a while before they are updated in this plugin.

In addition to the changes originally outlined, the creation of Dynamic Properties has been deprecated in PHP 8.2. See this link for details.
https://php.watch/versions/8.2/dynamic-properties-deprecated

To resolve the extensive logging of these notices add #[AllowDynamicProperties] attribute to the class definition, for example:

#[AllowDynamicProperties]
class User {
  private int $uid;
}

Make the change to include the #[AllowDynamicProperties] the following files:
lib/http/request.php
lib/iCal/helper/SG_iCal_Recurrence.php
lib/scheduling/utility.php
vendor/lessphp/lessc.inc.php