How to retrieve variables defined in a particular include file in php?

I want to know all the variables that have been declared within an include file.

Example code is:

1. Include file:

   开发者_如何学C

   <?php
   $a = 1;
   $b = 2;
   $c = 3;
   $myArr = array(5,6,7);
   ?>
   

2. Main file:

   <?php
   
   $first = get_defined_vars();
   include_once("include_vars.php");
   $second = get_defined_vars();
   
   $diff = array_diff($second ,$first);
   var_dump($diff);
   
   $x = 12;
   $y = 13;
   ?>
   

My attempt to use difference of get_defined_vars() does not seem to give accurate information. It gives:

array(2) {
  ["b"]=>
  int(2)
  ["c"]=>
  int(3)
}

$a and $myArr seem to be missing. What are other methods I can use?

It's really not a good thing to do this, hope it's needed just for debugging. Then you should find a difference between keys of the arrays that get_defined_vars return, not between their values:

$diff = array_diff(array_keys($second),array_keys($first));

If you don't want to include your file, a more complicated way would be using Tokenizer:

$tokens = token_get_all(file_get_contents("include_vars.php")); 

foreach($tokens as $token) {
    if ($token[0] == T_VARIABLE)
        echo $token[1] . ', ';
}

That would return all variables, even non-globals ones and the ones that were unset in that script (!)