tinyphp.class.php

<?php
class tinyPhp {
  
  public $php_excludes = array(
                          '$GLOBALS',
                          '$_SERVER',
                          '$_GET',
                          '$_POST',
                          '$_FILES',
                          '$_REQUEST',
                          '$_SESSION',
                          '$_ENV',
                          '$_COOKIE',
                          '$php_errormsg',
                          '$HTTP_RAW_POST_DATA',
                          '$http_response_header',
                          '$argc',
                          '$argv'
                          );
  
  function is_label($str) {
    return preg_match('~[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*+~',$str);
  }
  
  function get_tiny($snippet,
    $replace_variables=FALSE,
    $remove_whitespace=FALSE,
    $remove_comments=FALSE,
    $additional_excludes=array()) {
      
    //create excluded variables array
    $php_excludes = $this->php_excludes;
    if(!empty($additional_excludes)) {
      $excludes = array_merge($php_excludes,$additional_excludes);
      $excludes = array_unique($excludes);
    } else {
      $excludes = $php_excludes;
    }
    
    //generate tokens from snippet
    $tokens = token_get_all($snippet);
    
    //get all variables in snippet, remove comments
    $variables = array();
    $new_source = '';
    foreach ($tokens as $token) {
      if(!is_array($token)) {
        $new_source .= $token;
        continue;
      }
      if($token[0]==T_VARIABLE && !in_array($token[1],$excludes)) {
        $variables[] = $token[1];
      }
      if($remove_comments) {
        if(in_array($token[0],array(T_COMMENT,T_DOC_COMMENT))) {
          continue;
        }
      }
      $new_source .= $token[1];
    }
    $variables = array_unique($variables);
    
    //generate replace values for all variables
    if(!empty($variables)) {
      $replace_values = array();
      $count = 0;
      while($variable = current($variables)) {
        $mod = $count%26;

        $repeat_chars = ((int)floor($count/26))+1;

        $replace_int = 97+$mod;
        $replace_value = chr(36);

        for($i=1;$i<=$repeat_chars;$i++) {
          $replace_value .= chr($replace_int);
        }

        if(!in_array($replace_value,$variables) && !in_array($replace_value,$excludes)) {
          $variable_replace[$variable] = $replace_value;
          next($variables);
        }
        $count++;
      }
    }
    
    //get all tokens from previous iteration
    $tokens = token_get_all($new_source);
    
    //replace all variables, remove whitespace
    $new_source = '';
    foreach ($tokens as $i => $token) {
      if(!is_array($token)) {
        $new_source .= $token;
        continue;
      }
      if($replace_variables) {
        if($token[0] == T_VARIABLE && !in_array($token[1],$excludes)) {
          $key = $token[1];
          $new_source .= $variable_replace[$key];
          continue;
        }
      }
      if ($token[0] == T_WHITESPACE && $remove_whitespace) {
        if (isset($tokens[$i-1]) && isset($tokens[$i+1]) && is_array($tokens[$i-1]) && is_array($tokens[$i+1]) && $this->is_label($tokens[$i-1][1]) && $this->is_label($tokens[$i+1][1])) {
          $new_source .= ' ';
        }
      } elseif($token[0]==T_CASE) {
        $new_source .= $token[1].' ';
      } else {
        $new_source .= $token[1];
      }
    }
    return htmlentities($new_source);
  }
}