Detect PHP code in files with mixed content (PHP/HTML) by PHP for Obfuscate?

Question

Just wonder if exist class or function allow detect and replace only php code inside php file. I want Obfuscate only PHP code and keep HTML untouched and I don't think that preg_match is best way how to do this. So far I have this:

function replace_between($str) {
require_once 'plugins/Obfuscator.php';
$search = "/(<?php )(.*?)( ?>)/";
$check_str = preg_match($search,$str,$match);

 $sData = <<<'DATA'
    echo $match[1];
DATA;
$sObfusationData = new Obfuscator($sData, 'Class/Code NAME');

$new = preg_replace($search,$sObfusationData,$str);
return $new;

sample above doesn't work for few reasons, just for example what I want to get.

Answer 1

Detect PHP code in files with mixed content (PHP/HTML) by PHP for Obfuscate?

You can use the PHP tokenizer extension to achieve this properly.An example is the function below :

function findPHP($string){
        if(!is_string($string)) return false;

        $tokens=token_get_all($string);
        $php_code='';
        $result=array();
        $start=false;
        foreach($tokens as $key=>$token){
                if(is_array($token)&&token_name($token[0])==="T_OPEN_TAG"){
                    $start=true;
                    continue;
                }
                if(is_array($token)&&token_name($token[0])==="T_CLOSE_TAG"){
                    $start=false;
                    $result[]=$php_code;
                    $php_code='';
                    continue;
                }
                if($start){
                    if(is_array($token))
                        $php_code.=$token[1];
                    else
                        $php_code.=$token;
                }

        }
        return $result;
    }

    print_r(findPHP(file_get_contents('get_path.php')));

This function detect only the PHP code in any file with mixed content and return an array containing all the PHP code occurences.

Then all you have to do is to use your offuscator as you want.All that said you can alter lightly the function above to achieve your purpose.Example:

function find_and_offuscate_PHP($string){
        if(!is_string($string)) return false;

        $tokens=token_get_all($string);
        $php_code='';
        $result=array();
        $start=false;
        $from=false;
        foreach($tokens as $key=>$token){
                if(is_array($token)&&token_name($token[0])==="T_OPEN_TAG"){
                    $from=$key;
                    $start=true;
                    continue;
                }
                if(is_array($token)&&token_name($token[0])==="T_CLOSE_TAG"){
                    $start=false;
                    $result[$from]=$php_code;
                    $from=false;
                    $php_code='';
                    continue;
                }
                if($start){
                    if(is_array($token))
                        $php_code.=$token[1];
                    else
                        $php_code.=$token;
                    unset($tokens[$key]);
                }

        }
        if($start&&$from&&$php_code){
            $result[$from]=$php_code;
            unset($start,$from,$php_code);
        }
        // require_once 'plugins/Obfuscator.php';
        $result=array_map(function($php_code){
              // return  new Obfuscator($php_code, 'Class/Code NAME');
              return base64_encode($php_code);
        },$result);
        $tokens=array_map(function($token){return is_array($token)?$token[1]:$token;},$tokens);

        foreach($result as $from=> $offuscated){
            $tokens[$from] .= " $offuscated";
            unset($result[$from]);
        }

        return join(' ',$tokens);
    }

note that in this code i just use base64_encode for the test but i keep lines which use your own offuscator ,you just need to uncomment then and the function will be ready to use in your app.