Your solution
Fatal error: Uncaught Error: Function name must be a string in ...
appcodecoreMageCoreModelLayout.php:555 ...
This error was easy to fix because the problem was in the following line:
$out .= $this->getBlock($callback[0])->$callback[1]();
Instead it should be:
$out .= $this->getBlock($callback[0])->{$callback[1]}();
find your detail solution here on below given link
http://www.code007.ro/making-work-magento-with-php-7-rc1/
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