Error while starting the indexer: [] operator not supported for strings (PHP 7.1)

[derandy]

Starting the indexer in the Backend throws an Error which is related to PHP 7.1 afaik
Neither the BackendModule nor the scheduler is working.

[] operator not supported for strings

Error thrown in file
/../../typo3conf/ext/ke_search/Classes/hooks/class.user_kesearchhooks.php in line 41.

[steffenk]

this can be fixed easy:

tx_kesearch_indexer, line 40:
change var $additionalFields = ''; into var $additionalFields = [];

[a-r-m-i-n]

I am not able to reconstruct this issue. Tested with PHP 7.1.5 (7.1.5-1+deb.sury.org~xenial+1).

Also the \user_kesearch_sortdate::registerAdditionalFields method expects an array as parameter (which is referenced). So instead of overwriting the array always with an empty one, we should ensure that just arrays are passed to the method. We could also type hint the expected array, to make this method more strict.

As far as I can see in tx_kesearch_indexer, the default value for $this->additionalFields is already an array. So the only reason I can imagine why you got this issue, is that another registred hook destroys the array...

[christianbltr]

In class.tx_kesearch_indexer.php in Line 38 $additionalFields is already defined as $array.
It has been fixed in
4d7439a
So I'm closing this.