PHP5.x升級到PHP7.x後MediaWiki網站出現的問題

　　前兩周同事開始對阿裡雲服務器上的PHP 5升級為PHP 7，遇到的問題以及解決辦法我記錄在《PHP5.x升級到PHP7.x後Drupal網站出現的問題》一文中，本周對MediaWiki所在服務器要進行升級，所以先進行了一些測試，把Wiki站文件複制到已經升級為PHP 7.3.5的服務器上，馬上看到了一堆報錯，逐個去檢查、搜索、修改以緻全部解決，下面也來進行一些記錄。

　　首先在MediaWiki官方網站上找到MediaWiki各個版本對PHP的要求，我們目前的MediaWiki 1.27支持PHP 5.5.9+, 5.6.x, 7.0.x, 7.1.x，并沒有說支持7.2.x或者7.3.x，更多的第三方開發的擴展程序編寫時間更老、版本更新不及時，估計對PHP的兼容性也更差，程序總是需要修改的，所以我們幹脆就把MediaWiki 1.27直接放在安裝好PHP 7.3.5的服務器上。一些錯誤如下：

　　1.27核心程序的報錯：

• LocalisationCache.php報錯：這裡找到解決辦法，修改mediawiki/core / includes/cache/localisation/LocalisationCache.php文件；

　　還有很多類似這樣的報錯：

Warning: Parameter 1 to setupMetaDescriptionTagParserHooks() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to SyntaxHighlight_GeSHi::onParserFirstCallInit() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to PdfHandler::registerWarningModule() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to InputBoxHooks::register() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ImageMap::onParserFirstCallInit() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to GoogleRichCards() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to GadgetHooks::registerModules() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ExtVariables::onParserClearState() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ExtVariables::onInternalParseBeforeSanitize() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ExtVariables::init() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ExtLoops::onParserClearState() expected to be a reference, value given in includes/Hooks.php on line 195
Warning: Parameter 1 to ExtLoops::init() expected to be a reference, value given in includes/Hooks.php on line 195

　　查看Hooks.php文件195行也沒有什麼特别，在Google中搜索“Warning: Parameter 1 to  expected to be a reference, value given in Hooks.php on line 195”，都是說需要修改對應的第三方擴展中的public static function函數定義寫法，将&$this替換為$this，涉及到下面一些内容：

　　1.27發行版本帶的擴展程序的報錯：

• ConfirmEdit/includes/ConfirmEditHooks.php
• Gadgets/GadgetHooks.php
• ImageMap/ImageMap_body.php
• InputBox/InputBox.hooks.php
• ParserFunctions/ParserFunctions.hooks.php
• PdfHandler/PdfHandler_body.php
• SyntaxHighlight_GeSHi/SyntaxHighlight_GeSHi.class.php

　　我們自行下載安裝的擴展程序的報錯：

• GoogleRichCards/GoogleRichCards.php
• Loops/Loops.php
• MetaDescriptionTag/MetaDescriptionTag.php
• Variables/Variables.php
• Include/Include.php
• Memcached/Memcached.php (修改辦法稍微有點不一樣，來源：https://www.mediawiki.org/wiki/Extension_talk:Memcached )

　　我們自己開發的擴展中的報錯：

• ZhConvert/ZhConvert.php

　　這個過程還在進行中，後面發現新的問題會及時更新本文。

其它的錯誤：

Deprecated: The each() function is deprecated. This message will be suppressed on further calls in mediawiki_code-1.27.0/includes/MagicWordArray.php on line 197

修改includes/MagicWordArray.php on line 197

//jamesqi 2019-6-19 while (list( $key, $value ) = each( $m ) ) {
foreach ( $m as $key => $value ) {

再有這樣的報錯：

Deprecated: assert(): Calling assert() with a string argument is deprecated in mediawiki_code-1.27.0/includes/parser/Preprocessor_DOM.phpon line 542

修改includes/parser/Preprocessor_DOM.phpon line 542

// A heading must be open, otherwise \n wouldn't have been in the search list
//jamesqi 2019-6-19//assert( '$piece->open == "\n"' );
$piece->open == "\n";
$part = $piece->getCurrentPart();

再一個報錯：

Warning: session_id(): Cannot change session id when session is active in mediawiki_code-1.27.0/includes/Setup.php on line 773

暫未解決

　　2019-6-18補充：還可以在程序中添加：error_reporting(E_ALL ^ E_DEPRECATED); 來讓這種報錯不顯示，或者在php.ini裡面設置error_reporting = E_ALL &~E_NOTICE &~E_DEPRECATED。

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