如何获取影响变量的所有php代码？

Question

 <?php 
   class SomeClass {

   public function do_string(){
    $this->cacheFile(); 

    $unimportant_code = "unimportant";


    $someClass = new SomeClass(); 
    $some_string = $someClass->string; //Retruns 4 
    $some_string = $some_string + 2; 

    $variable = $some_string; //6 
    $this->pass($variable);
    }

   public function pass($var){ 
     //Do something with var and get the code I need
     $variable = $var; 

     require_once("template.php"); //In this file there's a code block 
     //{NOCACHE}
       //Do something with $variable;
     //{/NOCACHE} 


   }

   public function cacheFile(){ 
     //If file exists cache file 
     //If found {NOCACHE} {/NOCACHE} execute the code needed to change the $variable  between  {NOCACHE}{/NOCACHE} 
   }
}

    ?>

I want to get the exact coded affecting the value of $variable from the do_string() method that would be.

$someClass = new SomeClass() 
$some_string = $someClass->string //Retruns 4 
$some_string = $some_string + 2; 

$variable = $some_string; //6  

So that later I can execute it if needed, I'm trying to make a cache system. Is there anything like debug_backtrace() but for a $variable?

Answer 1

Having had a further conversation with you about what you are trying to achieve, I am going to formally answer your question by saying that this cannot be done in the way you are hoping in any straightforward manner.