Reliably retrieve PHP constant from a file [closed] - php

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Latest Edit:
Well, I came up with fairly "reliable" :) solution in form of a (portable) function, but since some ppl here got irked enough by not understanding the problem and blocked this question (a military solution: kill what you do not understand), I cannot post it here. Pity.
I have a set of files, which contain constants, like below.
define ('LNG_GSU_LNK_LBL', '[details]');
define( 'LNG_METHODCROSS_GSU_CLS' ,'class');
define('GSU_METH' , 'method');
define ( 'CROSS_GSU_ACTION_NO_REMOVE', 'cannot remove \' module \'(is); deployed');
What would be most reliable method to retrieve constant names and values from given, selected file.
EDIT:
I need to get these constants into array, without defining them actually, directly by reading file, e.g.:
array('LNG_GSU_LNK_LBL'=>'[details]','LNG_METHODCROSS_GSU_CLS'=> 'class')
... etc
EDIT 2:
So far I got this far:
$file_array = file($path, FILE_SKIP_EMPTY_LINES);
//implode lang file into a string removing php tags
$string1 = implode('', $file_array);
$string2 = str_replace(array(''), '', $string1);
//regex removing content between markers
$regex = '/\/\*.+?\*\//si';
$replace_with = '';
$replace_where = $string2;
$string3 = preg_replace($regex, $replace_with, $replace_where);
//regex: remove multiple newlines
$string4 = preg_replace("/\n+/", "\n", $string3);
EDIT 3:
expected result
array (
'LNG_GSU_LNK_LBL' => '[details]',
'LNG_METHODCROSS_GSU_CLS' => 'class',
'GSU_METH' => 'method',
'CROSS_GSU_ACTION_NO_REMOVE' => 'cannot remove \' module \'(is); deployed'
);

Answer 1

If you dont want to include the file, then you should use: token_get_all().
Otherwise, you should require/include the file containing them and you can iteratively use get_defined_constants():
$all = array();
$consts = get_defined_constants();
foreach($consts as $k=>$v){
if (strpos($k,"LNG")===0 && !isset($all[$k]))
$all[$k]=$v;
}
Note that parsing php source code is like parsing HTML with regex, better bet avoid it.

Answer 2

Building on dynamic's answer, include the file within another, separate, web accessible file, that is not loaded within your current application (so will have no other user defined constants at run time):
//standalone.php
include "that_file.php";
$consts = get_defined_constants(true);
$newUserConsts = $consts['user'];
echo json_encode($newUserConsts);
//within your application
$newUserConsts = json_decode(file_get_contents('http://yoursite.com/standalone.php'));
Or if you cant make a separate web accessible file:
$consts = get_defined_constants(true);
$existingUserConsts = $consts['user'];
include "that_file.php";
$consts = get_defined_constants(true);
$newUserConsts = $consts['user'];
var_dump(array_diff_key($newUserConsts, $existingUserConsts));