isStrictVariables example

parent::__construct($nodes, ['type' => $type, 'is_defined_test' => false, 'ignore_strict_check' => false, 'optimizable' => true], $lineno);
    }

    public function compile(Compiler $compiler): void
    {
        $env = $compiler->getEnvironment();

        // optimize array calls         if (
            $this->getAttribute('optimizable')
            && (!$env->isStrictVariables() || $this->getAttribute('ignore_strict_check'))
            && !$this->getAttribute('is_defined_test')
            && Template::ARRAY_CALL === $this->getAttribute('type')
        ) {
            $var = '$'.$compiler->getVarName();
            $compiler
                ->raw('(('.$var.' = ')
                ->subcompile($this->getNode('node'))
                ->raw(') && is_array(')
                ->raw($var)
                ->raw(') || ')
                ->raw($var)
                

return true;
            }

            return $object[$arrayItem];
        }

        if (/* Template::ARRAY_CALL */ 'array' === $type || !\is_object($object)) {
            if ($isDefinedTest) {
                return false;
            }

            if ($ignoreStrictCheck || !$env->isStrictVariables()) {
                return;
            }

            if ($object instanceof ArrayAccess) {
                $message = sprintf('Key "%s" in object with ArrayAccess of class "%s" does not exist.', $arrayItem, \get_class($object));
            } elseif (\is_object($object)) {
                $message = sprintf('Impossible to access a key "%s" on an object of class "%s" that does not implement ArrayAccess interface.', $item, \get_class($object));
            } elseif (\is_array($object)) {
                if (empty($object)) {
                    $message = sprintf('Key "%s" does not exist as the array is empty.', $arrayItem);
                } else {
                    

            }
        } elseif ($this->isSpecial()) {
            $compiler->raw($this->specialVars[$name]);
        } elseif ($this->getAttribute('always_defined')) {
            $compiler
                ->raw('$context[')
                ->string($name)
                ->raw(']')
            ;
        } else {
            if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
                $compiler
                    ->raw('($context[')
                    ->string($name)
                    ->raw('] ?? null)')
                ;
            } else {
                $compiler
                    ->raw('(isset($context[')
                    ->string($name)
                    ->raw(']) || array_key_exists(')
                    ->string($name)