How to fix fatal error uncaught error function name must be a string in magento

How to fix fatal error uncaught error function name must be a string in magento:

Most of the people may get this below error message while installing magento1.x .

Error: fatal error uncaught error function name must be a string in magento app\code\core\Mage\Core\Model\Layout.php:555

Reason for this issue:

1. This will happen when you run Magento1.x  on PHP7 version.

2. We need to clarify whether, we are using $callback[1]() is as method or variable on PHP.

Solution:

1. In case if you want to run Magento1.x on PHP7 version then we want to do some code change. So that this got fix.
2. To fix this issue change line into below way.File Path: app\code\core\Mage\Core\Model\Layout.php:555
   $out .= $this->getBlock($callback[0])->$callback[1]();to
   $out .= $this->getBlock($callback[0])->{$callback[1]}();

    

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