Magento 1.x Resolve error on PHP 7

Magento 1.9.3 doesn’t run with PHP 7, it will show error like below:

Fatal error: Uncaught Error: Function name must be a string in 
app\code\core\Mage\Core\Model\Layout.php

1 2	Fatal error: Uncaught Error: Function name must be a string in app\code\core\Mage\Core\Model\Layout.php

Find the below line in app/code/core/Mage/Core/Model/Layout.php file (line: 555)

$out .= $this->getBlock($callback[0])->$callback[1]();

1	$out .= $this->getBlock($callback[0])->$callback[1]();

And Replace it with below line:

$out .= $this->getBlock($callback[0])->{$callback[1]}();

1	$out .= $this->getBlock($callback[0])->{$callback[1]}();

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