MediaWiki REL1_33
ApiQueryCategoryMembers.php
Go to the documentation of this file.
1<?php
29
30 public function __construct( ApiQuery $query, $moduleName ) {
31 parent::__construct( $query, $moduleName, 'cm' );
32 }
33
34 public function execute() {
35 $this->run();
36 }
37
38 public function getCacheMode( $params ) {
39 return 'public';
40 }
41
42 public function executeGenerator( $resultPageSet ) {
43 $this->run( $resultPageSet );
44 }
45
50 private function validateHexSortkey( $hexSortkey ) {
51 // A hex sortkey has an unbound number of 2 letter pairs
52 return (bool)preg_match( '/^(?:[a-fA-F0-9]{2})*$/D', $hexSortkey );
53 }
54
59 private function run( $resultPageSet = null ) {
61
62 $categoryTitle = $this->getTitleOrPageId( $params )->getTitle();
63 if ( $categoryTitle->getNamespace() != NS_CATEGORY ) {
64 $this->dieWithError( 'apierror-invalidcategory' );
65 }
66
67 $prop = array_flip( $params['prop'] );
68 $fld_ids = isset( $prop['ids'] );
69 $fld_title = isset( $prop['title'] );
70 $fld_sortkey = isset( $prop['sortkey'] );
71 $fld_sortkeyprefix = isset( $prop['sortkeyprefix'] );
72 $fld_timestamp = isset( $prop['timestamp'] );
73 $fld_type = isset( $prop['type'] );
74
75 if ( is_null( $resultPageSet ) ) {
76 $this->addFields( [ 'cl_from', 'cl_sortkey', 'cl_type', 'page_namespace', 'page_title' ] );
77 $this->addFieldsIf( 'page_id', $fld_ids );
78 $this->addFieldsIf( 'cl_sortkey_prefix', $fld_sortkeyprefix );
79 } else {
80 $this->addFields( $resultPageSet->getPageTableFields() ); // will include page_ id, ns, title
81 $this->addFields( [ 'cl_from', 'cl_sortkey', 'cl_type' ] );
82 }
83
84 $this->addFieldsIf( 'cl_timestamp', $fld_timestamp || $params['sort'] == 'timestamp' );
85
86 $this->addTables( [ 'page', 'categorylinks' ] ); // must be in this order for 'USE INDEX'
87
88 $this->addWhereFld( 'cl_to', $categoryTitle->getDBkey() );
89 $queryTypes = $params['type'];
90 $contWhere = false;
91
92 // Scanning large datasets for rare categories sucks, and I already told
93 // how to have efficient subcategory access :-) ~~~~ (oh well, domas)
94 $miser_ns = [];
95 if ( $this->getConfig()->get( 'MiserMode' ) ) {
96 $miser_ns = $params['namespace'] ?: [];
97 } else {
98 $this->addWhereFld( 'page_namespace', $params['namespace'] );
99 }
100
101 $dir = in_array( $params['dir'], [ 'asc', 'ascending', 'newer' ] ) ? 'newer' : 'older';
102
103 if ( $params['sort'] == 'timestamp' ) {
104 $this->addTimestampWhereRange( 'cl_timestamp',
105 $dir,
106 $params['start'],
107 $params['end'] );
108 // Include in ORDER BY for uniqueness
109 $this->addWhereRange( 'cl_from', $dir, null, null );
110
111 if ( !is_null( $params['continue'] ) ) {
112 $cont = explode( '|', $params['continue'] );
113 $this->dieContinueUsageIf( count( $cont ) != 2 );
114 $op = ( $dir === 'newer' ? '>' : '<' );
115 $db = $this->getDB();
116 $continueTimestamp = $db->addQuotes( $db->timestamp( $cont[0] ) );
117 $continueFrom = (int)$cont[1];
118 $this->dieContinueUsageIf( $continueFrom != $cont[1] );
119 $this->addWhere( "cl_timestamp $op $continueTimestamp OR " .
120 "(cl_timestamp = $continueTimestamp AND " .
121 "cl_from $op= $continueFrom)"
122 );
123 }
124
125 $this->addOption( 'USE INDEX', 'cl_timestamp' );
126 } else {
127 if ( $params['continue'] ) {
128 $cont = explode( '|', $params['continue'], 3 );
129 $this->dieContinueUsageIf( count( $cont ) != 3 );
130
131 // Remove the types to skip from $queryTypes
132 $contTypeIndex = array_search( $cont[0], $queryTypes );
133 $queryTypes = array_slice( $queryTypes, $contTypeIndex );
134
135 // Add a WHERE clause for sortkey and from
136 $this->dieContinueUsageIf( !$this->validateHexSortkey( $cont[1] ) );
137 $escSortkey = $this->getDB()->addQuotes( hex2bin( $cont[1] ) );
138 $from = (int)$cont[2];
139 $op = $dir == 'newer' ? '>' : '<';
140 // $contWhere is used further down
141 $contWhere = "cl_sortkey $op $escSortkey OR " .
142 "(cl_sortkey = $escSortkey AND " .
143 "cl_from $op= $from)";
144 // The below produces ORDER BY cl_sortkey, cl_from, possibly with DESC added to each of them
145 $this->addWhereRange( 'cl_sortkey', $dir, null, null );
146 $this->addWhereRange( 'cl_from', $dir, null, null );
147 } else {
148 if ( $params['startsortkeyprefix'] !== null ) {
149 $startsortkey = Collation::singleton()->getSortKey( $params['startsortkeyprefix'] );
150 } elseif ( $params['starthexsortkey'] !== null ) {
151 if ( !$this->validateHexSortkey( $params['starthexsortkey'] ) ) {
152 $encParamName = $this->encodeParamName( 'starthexsortkey' );
153 $this->dieWithError( [ 'apierror-badparameter', $encParamName ], "badvalue_$encParamName" );
154 }
155 $startsortkey = hex2bin( $params['starthexsortkey'] );
156 } else {
157 $startsortkey = $params['startsortkey'];
158 }
159 if ( $params['endsortkeyprefix'] !== null ) {
160 $endsortkey = Collation::singleton()->getSortKey( $params['endsortkeyprefix'] );
161 } elseif ( $params['endhexsortkey'] !== null ) {
162 if ( !$this->validateHexSortkey( $params['endhexsortkey'] ) ) {
163 $encParamName = $this->encodeParamName( 'endhexsortkey' );
164 $this->dieWithError( [ 'apierror-badparameter', $encParamName ], "badvalue_$encParamName" );
165 }
166 $endsortkey = hex2bin( $params['endhexsortkey'] );
167 } else {
168 $endsortkey = $params['endsortkey'];
169 }
170
171 // The below produces ORDER BY cl_sortkey, cl_from, possibly with DESC added to each of them
172 $this->addWhereRange( 'cl_sortkey',
173 $dir,
174 $startsortkey,
175 $endsortkey );
176 $this->addWhereRange( 'cl_from', $dir, null, null );
177 }
178 $this->addOption( 'USE INDEX', 'cl_sortkey' );
179 }
180
181 $this->addWhere( 'cl_from=page_id' );
182
183 $limit = $params['limit'];
184 $this->addOption( 'LIMIT', $limit + 1 );
185
186 if ( $params['sort'] == 'sortkey' ) {
187 // Run a separate SELECT query for each value of cl_type.
188 // This is needed because cl_type is an enum, and MySQL has
189 // inconsistencies between ORDER BY cl_type and
190 // WHERE cl_type >= 'foo' making proper paging impossible
191 // and unindexed.
192 $rows = [];
193 $first = true;
194 foreach ( $queryTypes as $type ) {
195 $extraConds = [ 'cl_type' => $type ];
196 if ( $first && $contWhere ) {
197 // Continuation condition. Only added to the
198 // first query, otherwise we'll skip things
199 $extraConds[] = $contWhere;
200 }
201 $res = $this->select( __METHOD__, [ 'where' => $extraConds ] );
202 $rows = array_merge( $rows, iterator_to_array( $res ) );
203 if ( count( $rows ) >= $limit + 1 ) {
204 break;
205 }
206 $first = false;
207 }
208 } else {
209 // Sorting by timestamp
210 // No need to worry about per-type queries because we
211 // aren't sorting or filtering by type anyway
212 $res = $this->select( __METHOD__ );
213 $rows = iterator_to_array( $res );
214 }
215
216 $result = $this->getResult();
217 $count = 0;
218 foreach ( $rows as $row ) {
219 if ( ++$count > $limit ) {
220 // We've reached the one extra which shows that there are
221 // additional pages to be had. Stop here...
222 // @todo Security issue - if the user has no right to view next
223 // title, it will still be shown
224 if ( $params['sort'] == 'timestamp' ) {
225 $this->setContinueEnumParameter( 'continue', "$row->cl_timestamp|$row->cl_from" );
226 } else {
227 $sortkey = bin2hex( $row->cl_sortkey );
228 $this->setContinueEnumParameter( 'continue',
229 "{$row->cl_type}|$sortkey|{$row->cl_from}"
230 );
231 }
232 break;
233 }
234
235 // Since domas won't tell anyone what he told long ago, apply
236 // cmnamespace here. This means the query may return 0 actual
237 // results, but on the other hand it could save returning 5000
238 // useless results to the client. ~~~~
239 if ( count( $miser_ns ) && !in_array( $row->page_namespace, $miser_ns ) ) {
240 continue;
241 }
242
243 if ( is_null( $resultPageSet ) ) {
244 $vals = [
245 ApiResult::META_TYPE => 'assoc',
246 ];
247 if ( $fld_ids ) {
248 $vals['pageid'] = (int)$row->page_id;
249 }
250 if ( $fld_title ) {
251 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
253 }
254 if ( $fld_sortkey ) {
255 $vals['sortkey'] = bin2hex( $row->cl_sortkey );
256 }
257 if ( $fld_sortkeyprefix ) {
258 $vals['sortkeyprefix'] = $row->cl_sortkey_prefix;
259 }
260 if ( $fld_type ) {
261 $vals['type'] = $row->cl_type;
262 }
263 if ( $fld_timestamp ) {
264 $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->cl_timestamp );
265 }
266 $fit = $result->addValue( [ 'query', $this->getModuleName() ],
267 null, $vals );
268 if ( !$fit ) {
269 if ( $params['sort'] == 'timestamp' ) {
270 $this->setContinueEnumParameter( 'continue', "$row->cl_timestamp|$row->cl_from" );
271 } else {
272 $sortkey = bin2hex( $row->cl_sortkey );
273 $this->setContinueEnumParameter( 'continue',
274 "{$row->cl_type}|$sortkey|{$row->cl_from}"
275 );
276 }
277 break;
278 }
279 } else {
280 $resultPageSet->processDbRow( $row );
281 }
282 }
283
284 if ( is_null( $resultPageSet ) ) {
285 $result->addIndexedTagName(
286 [ 'query', $this->getModuleName() ], 'cm' );
287 }
288 }
289
290 public function getAllowedParams() {
291 $ret = [
292 'title' => [
293 ApiBase::PARAM_TYPE => 'string',
294 ],
295 'pageid' => [
296 ApiBase::PARAM_TYPE => 'integer'
297 ],
298 'prop' => [
299 ApiBase::PARAM_DFLT => 'ids|title',
302 'ids',
303 'title',
304 'sortkey',
305 'sortkeyprefix',
306 'type',
307 'timestamp',
308 ],
310 ],
311 'namespace' => [
313 ApiBase::PARAM_TYPE => 'namespace',
314 ],
315 'type' => [
317 ApiBase::PARAM_DFLT => 'page|subcat|file',
319 'page',
320 'subcat',
321 'file'
322 ]
323 ],
324 'continue' => [
325 ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
326 ],
327 'limit' => [
328 ApiBase::PARAM_TYPE => 'limit',
333 ],
334 'sort' => [
335 ApiBase::PARAM_DFLT => 'sortkey',
337 'sortkey',
338 'timestamp'
339 ]
340 ],
341 'dir' => [
342 ApiBase::PARAM_DFLT => 'ascending',
344 'asc',
345 'desc',
346 // Normalising with other modules
347 'ascending',
348 'descending',
349 'newer',
350 'older',
351 ]
352 ],
353 'start' => [
354 ApiBase::PARAM_TYPE => 'timestamp'
355 ],
356 'end' => [
357 ApiBase::PARAM_TYPE => 'timestamp'
358 ],
359 'starthexsortkey' => null,
360 'endhexsortkey' => null,
361 'startsortkeyprefix' => null,
362 'endsortkeyprefix' => null,
363 'startsortkey' => [
365 ],
366 'endsortkey' => [
368 ],
369 ];
370
371 if ( $this->getConfig()->get( 'MiserMode' ) ) {
372 $ret['namespace'][ApiBase::PARAM_HELP_MSG_APPEND] = [
373 'api-help-param-limited-in-miser-mode',
374 ];
375 }
376
377 return $ret;
378 }
379
380 protected function getExamplesMessages() {
381 return [
382 'action=query&list=categorymembers&cmtitle=Category:Physics'
383 => 'apihelp-query+categorymembers-example-simple',
384 'action=query&generator=categorymembers&gcmtitle=Category:Physics&prop=info'
385 => 'apihelp-query+categorymembers-example-generator',
386 ];
387 }
388
389 public function getHelpUrls() {
390 return 'https://www.mediawiki.org/wiki/Special:MyLanguage/API:Categorymembers';
391 }
392}
wfTimestamp( $outputtype=TS_UNIX, $ts=0)
Get a timestamp string in one of various formats.
const PARAM_MAX2
(integer) Max value allowed for the parameter for users with the apihighlimits right,...
Definition ApiBase.php:96
const PARAM_DEPRECATED
(boolean) Is the parameter deprecated (will show a warning)?
Definition ApiBase.php:105
const PARAM_MAX
(integer) Max value allowed for the parameter, for PARAM_TYPE 'integer' and 'limit'.
Definition ApiBase.php:90
dieWithError( $msg, $code=null, $data=null, $httpCode=null)
Abort execution with an error.
Definition ApiBase.php:1990
dieContinueUsageIf( $condition)
Die with the 'badcontinue' error.
Definition ApiBase.php:2176
const PARAM_TYPE
(string|string[]) Either an array of allowed value strings, or a string type as described below.
Definition ApiBase.php:87
const PARAM_DFLT
(null|boolean|integer|string) Default value of the parameter.
Definition ApiBase.php:48
const PARAM_HELP_MSG_APPEND
((string|array|Message)[]) Specify additional i18n messages to append to the normal message for this ...
Definition ApiBase.php:131
const PARAM_HELP_MSG_PER_VALUE
((string|array|Message)[]) When PARAM_TYPE is an array, this is an array mapping those values to $msg...
Definition ApiBase.php:157
const PARAM_MIN
(integer) Lowest value allowed for the parameter, for PARAM_TYPE 'integer' and 'limit'.
Definition ApiBase.php:99
const LIMIT_BIG1
Fast query, standard limit.
Definition ApiBase.php:252
getResult()
Get the result object.
Definition ApiBase.php:632
extractRequestParams( $options=[])
Using getAllowedParams(), this function makes an array of the values provided by the user,...
Definition ApiBase.php:743
const PARAM_HELP_MSG
(string|array|Message) Specify an alternative i18n documentation message for this parameter.
Definition ApiBase.php:124
const LIMIT_BIG2
Fast query, apihighlimits limit.
Definition ApiBase.php:254
getModuleName()
Get the name of the module being executed by this instance.
Definition ApiBase.php:512
getTitleOrPageId( $params, $load=false)
Get a WikiPage object from a title or pageid param, if possible.
Definition ApiBase.php:1016
const PARAM_ISMULTI
(boolean) Accept multiple pipe-separated values for this parameter (e.g.
Definition ApiBase.php:51
static addTitleInfo(&$arr, $title, $prefix='')
Add information (title and namespace) about a Title object to a result array.
addWhereRange( $field, $dir, $start, $end, $sort=true)
Add a WHERE clause corresponding to a range, and an ORDER BY clause to sort in the right direction.
addFields( $value)
Add a set of fields to select to the internal array.
addOption( $name, $value=null)
Add an option such as LIMIT or USE INDEX.
addTables( $tables, $alias=null)
Add a set of tables to the internal array.
addTimestampWhereRange( $field, $dir, $start, $end, $sort=true)
Add a WHERE clause corresponding to a range, similar to addWhereRange, but converts $start and $end t...
getDB()
Get the Query database connection (read-only)
addFieldsIf( $value, $condition)
Same as addFields(), but add the fields only if a condition is met.
addWhereFld( $field, $value)
Equivalent to addWhere(array($field => $value))
addWhere( $value)
Add a set of WHERE clauses to the internal array.
A query module to enumerate pages that belong to a category.
execute()
Evaluates the parameters, performs the requested query, and sets up the result.
executeGenerator( $resultPageSet)
Execute this module as a generator.
__construct(ApiQuery $query, $moduleName)
getAllowedParams()
Returns an array of allowed parameters (parameter name) => (default value) or (parameter name) => (ar...
getCacheMode( $params)
Get the cache mode for the data generated by this module.
getExamplesMessages()
Returns usage examples for this module.
getHelpUrls()
Return links to more detailed help pages about the module.
setContinueEnumParameter( $paramName, $paramValue)
Overridden to set the generator param if in generator mode.
encodeParamName( $paramName)
Overrides ApiBase to prepend 'g' to every generator parameter.
This is the main query class.
Definition ApiQuery.php:36
const META_TYPE
Key for the 'type' metadata item.
static singleton()
Definition Collation.php:36
We use the convention $dbr for read and $dbw for write to help you keep track of whether the database object is a the world will explode Or to be a subsequent write query which succeeded on the master may fail when replicated to the slave due to a unique key collision Replication on the slave will stop and it may take hours to repair the database and get it back online Setting read_only in my cnf on the slave will avoid this but given the dire we prefer to have as many checks as possible We provide a but the wrapper functions like select() and insert() are usually more convenient. They take care of things like table prefixes and escaping for you. If you really need to make your own SQL
$res
Definition database.txt:21
This document is intended to provide useful advice for parties seeking to redistribute MediaWiki to end users It s targeted particularly at maintainers for Linux since it s been observed that distribution packages of MediaWiki often break We ve consistently had to recommend that users seeking support use official tarballs instead of their distribution s and this often solves whatever problem the user is having It would be nice if this could such as
const NS_CATEGORY
Definition Defines.php:87
do that in ParserLimitReportFormat instead use this to modify the parameters of the image all existing parser cache entries will be invalid To avoid you ll need to handle that somehow(e.g. with the RejectParserCacheValue hook) because MediaWiki won 't do it for you. & $defaults also a ContextSource after deleting those rows but within the same transaction $rows
Definition hooks.txt:2818
The index of the header message $result[1]=The index of the body text message $result[2 through n]=Parameters passed to body text message. Please note the header message cannot receive/use parameters. 'ImgAuthModifyHeaders':Executed just before a file is streamed to a user via img_auth.php, allowing headers to be modified beforehand. $title:LinkTarget object & $headers:HTTP headers(name=> value, names are case insensitive). Two headers get special handling:If-Modified-Since(value must be a valid HTTP date) and Range(must be of the form "bytes=(\d*-\d*)") will be honored when streaming the file. 'ImportHandleLogItemXMLTag':When parsing a XML tag in a log item. Return false to stop further processing of the tag $reader:XMLReader object $logInfo:Array of information 'ImportHandlePageXMLTag':When parsing a XML tag in a page. Return false to stop further processing of the tag $reader:XMLReader object & $pageInfo:Array of information 'ImportHandleRevisionXMLTag':When parsing a XML tag in a page revision. Return false to stop further processing of the tag $reader:XMLReader object $pageInfo:Array of page information $revisionInfo:Array of revision information 'ImportHandleToplevelXMLTag':When parsing a top level XML tag. Return false to stop further processing of the tag $reader:XMLReader object 'ImportHandleUnknownUser':When a user doesn 't exist locally, this hook is called to give extensions an opportunity to auto-create it. If the auto-creation is successful, return false. $name:User name 'ImportHandleUploadXMLTag':When parsing a XML tag in a file upload. Return false to stop further processing of the tag $reader:XMLReader object $revisionInfo:Array of information 'ImportLogInterwikiLink':Hook to change the interwiki link used in log entries and edit summaries for transwiki imports. & $fullInterwikiPrefix:Interwiki prefix, may contain colons. & $pageTitle:String that contains page title. 'ImportSources':Called when reading from the $wgImportSources configuration variable. Can be used to lazy-load the import sources list. & $importSources:The value of $wgImportSources. Modify as necessary. See the comment in DefaultSettings.php for the detail of how to structure this array. 'InfoAction':When building information to display on the action=info page. $context:IContextSource object & $pageInfo:Array of information 'InitializeArticleMaybeRedirect':MediaWiki check to see if title is a redirect. & $title:Title object for the current page & $request:WebRequest & $ignoreRedirect:boolean to skip redirect check & $target:Title/string of redirect target & $article:Article object 'InternalParseBeforeLinks':during Parser 's internalParse method before links but after nowiki/noinclude/includeonly/onlyinclude and other processings. & $parser:Parser object & $text:string containing partially parsed text & $stripState:Parser 's internal StripState object 'InternalParseBeforeSanitize':during Parser 's internalParse method just before the parser removes unwanted/dangerous HTML tags and after nowiki/noinclude/includeonly/onlyinclude and other processings. Ideal for syntax-extensions after template/parser function execution which respect nowiki and HTML-comments. & $parser:Parser object & $text:string containing partially parsed text & $stripState:Parser 's internal StripState object 'InterwikiLoadPrefix':When resolving if a given prefix is an interwiki or not. Return true without providing an interwiki to continue interwiki search. $prefix:interwiki prefix we are looking for. & $iwData:output array describing the interwiki with keys iw_url, iw_local, iw_trans and optionally iw_api and iw_wikiid. 'InvalidateEmailComplete':Called after a user 's email has been invalidated successfully. $user:user(object) whose email is being invalidated 'IRCLineURL':When constructing the URL to use in an IRC notification. Callee may modify $url and $query, URL will be constructed as $url . $query & $url:URL to index.php & $query:Query string $rc:RecentChange object that triggered url generation 'IsFileCacheable':Override the result of Article::isFileCacheable()(if true) & $article:article(object) being checked 'IsTrustedProxy':Override the result of IP::isTrustedProxy() & $ip:IP being check & $result:Change this value to override the result of IP::isTrustedProxy() 'IsUploadAllowedFromUrl':Override the result of UploadFromUrl::isAllowedUrl() $url:URL used to upload from & $allowed:Boolean indicating if uploading is allowed for given URL 'isValidEmailAddr':Override the result of Sanitizer::validateEmail(), for instance to return false if the domain name doesn 't match your organization. $addr:The e-mail address entered by the user & $result:Set this and return false to override the internal checks 'isValidPassword':Override the result of User::isValidPassword() $password:The password entered by the user & $result:Set this and return false to override the internal checks $user:User the password is being validated for 'Language::getMessagesFileName':$code:The language code or the language we 're looking for a messages file for & $file:The messages file path, you can override this to change the location. 'LanguageGetNamespaces':Provide custom ordering for namespaces or remove namespaces. Do not use this hook to add namespaces. Use CanonicalNamespaces for that. & $namespaces:Array of namespaces indexed by their numbers 'LanguageGetTranslatedLanguageNames':Provide translated language names. & $names:array of language code=> language name $code:language of the preferred translations 'LanguageLinks':Manipulate a page 's language links. This is called in various places to allow extensions to define the effective language links for a page. $title:The page 's Title. & $links:Array with elements of the form "language:title" in the order that they will be output. & $linkFlags:Associative array mapping prefixed links to arrays of flags. Currently unused, but planned to provide support for marking individual language links in the UI, e.g. for featured articles. 'LanguageSelector':Hook to change the language selector available on a page. $out:The output page. $cssClassName:CSS class name of the language selector. 'LinkBegin':DEPRECATED since 1.28! Use HtmlPageLinkRendererBegin instead. Used when generating internal and interwiki links in Linker::link(), before processing starts. Return false to skip default processing and return $ret. See documentation for Linker::link() for details on the expected meanings of parameters. $skin:the Skin object $target:the Title that the link is pointing to & $html:the contents that the< a > tag should have(raw HTML) $result
Definition hooks.txt:1991
namespace and then decline to actually register it file or subcat img or subcat $title
Definition hooks.txt:955
null means default in associative array with keys and values unescaped Should be merged with default with a value of false meaning to suppress the attribute in associative array with keys and values unescaped noclasses & $ret
Definition hooks.txt:2003
null for the local wiki Added should default to null in handler for backwards compatibility add a value to it if you want to add a cookie that have to vary cache options can modify $query
Definition hooks.txt:1617
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition injection.txt:37
$params