[TYPO3-english] Core update feature of Install tool does not work with PHP7

[David Henninger]

I cannot use the update check & upgrade functionality of the install tool with PHP7 (7.0.18-1~dotdeb+8.1), while it still works with PHP5 (5.6.30-0+deb8u1). I get the following error when checking for a new update (7.6.18 is already installed):

#1289386765: Could not analyse class: "TYPO3\CMS\Install\Controller\Action\Ajax\CoreUpdateUpdateVersionMatrix" maybe not loaded or no autoloader? PHP Warning: Declaration of TYPO3\CMS\Install\Controller\Action\Ajax\AbstractCoreUpdate::injectView(TYPO3\CMS\Install\View\JsonView $view) should be compatible with TYPO3\CMS\Install\Controller\Action\AbstractAction::injectView(TYPO3\CMS\Install\View\FailsafeView $view) in /var/www/typo3_src/typo3_src-7.6.18/typo3/sysext/install/Classes/Controller/Action/Ajax/AbstractCoreUpdate.php line 21