how blade can access to defined varibles outside of itself

Question

i want to create a template engine with php regex

my template engine is the following code

<?php

    class tmp
    {
        public function assign($name,$val){
            $GLOBALS[$name]=$val;
        }
        public function compile($buffer){
            $buffer= '?> '.preg_replace('~\{\!\!\s*\$(\w+)\s*\!\!\}~', '<?php echo $GLOBALS["$1"]; ?>', $buffer);

            file_put_contents('compiled.php', $buffer);
            return $buffer;
        }
        public function run($run){
            return eval($run);
        }
    }

?>

and my theme is the following code

{!! $bar !!} 

and compiled theme is

 ?> 
    <?php echo $GLOBALS["bar"]; ?> 

I access to vars with $GLOBALS but in blade the compiled code is as follows

<?php echo $bar; ?>

how blade can access to defined vars directly with their name?

Answer 1

I can't confirm this is how blade is doing it, though I suspect it would be, but basically extract does that exactly what you are asking:

http://php.net/manual/en/function.extract.php

It takes an array of variables and inserts directly into the symbol tables so they be accessed directly. Used in combination with get_defined_variables() it becomes very useful.