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Code like Hooks::run( 'WantedPages::getQueryInfo', [ &$this, &$query ] ); will trigger warnings in PHP 7.1. Ideally the solution would be to remove &, which hasn't been needed since PHP 4, however that breaks backwards-compatibility.

Instead, we can rename $this to a different variable, and then pass it by reference. Example:

// Avoid PHP 7.1 warning of passing $this by reference
$editPage = $this;
Hooks::run( 'EditPage::showEditForm:initial', [ &$editPage, &$out ] );

See https://bugs.php.net/bug.php?id=73751 / https://wiki.php.net/rfc/this_var

Example commit: https://gerrit.wikimedia.org/r/#/c/328387/

More information:

• https://secure.php.net/manual/en/migration71.incompatible.php
• https://blog.pascal-martin.fr/post/php71-en-a-few-bc-breaks-and-conclusion.html

You are expected to provide patches in Wikimedia Gerrit (one patch for each repository). See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.

The repositories / files to fix for this task are:

• skins/webplatform/WebPlatformTemplate.class.php (2 occurrences)
• extensions/NewUserNotif/NewUserNotif.class.php (2 occurrences)