cast int for addIndexKey()

Does it solve scrutinizer inspection?
The expression ``$this->addIndexKey('page', '', $page);`` of type ``false|integer|string`` adds the type ``string`` to the return on

cast int for addIndexKey()

Does it solve scrutinizer inspection?
The expression ``$this->addIndexKey('page', '', $page);`` of type ``false|integer|string`` adds the type ``string`` to the return on line 73 which is incompatible with the return type documented by ``dokuwiki\Search\AbstractIndex::getPID`` of type ``integer|false``.

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rewrite deprecated ft_* functions

remove getInstance() from AbstractIndex

fix $errors static

fix Undefined methods dispatcher

Undefined methods dispatcher

prepared for unit tests compatibility only

define histogram() in PageIndex class

allow public access to getIndex(), etc.

obsolete deletePageNoLock()

separate deletePageNoLock() process

set $errors when index lock() failed

child class of AbstractIndex must have claer()

make $pidCache static, refactor getPID()

all extending acstract classes should use a static pidCache array

separate methods into metadata, Pageword, Page index classes

Abstraction Index classes

PageIndex, PagewordIndex, MetadataIndex inherit the AbstractIndex class

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name w

Extract dokuwiki\Search\Indexer class

Not sure why Doku_Indexer caused phpcs to complain about the class name
not being in PascalCase, but Doku_Handler didn't. ��

The namespace and new class name was selected to be compatible with the
upcoming changes in #2943. This should hpopefully reduce the overall
hassle of touching the same code base.

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