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PHPCompactor.php
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PHPCompactor.php
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<?php
/**
* PHP Code Compactor
*
* Do not use this to speed up your PHP by compacting it. I will come for you.
* Use a *real* bytecode cache: http://en.wikipedia.org/wiki/List_of_PHP_accelerators
*
* Instead use this to get an idea of the TRUE size of projects by comparing
* the actual number of characters required to run that class - without long
* variable names, comments, or other added "fluff".
*
* @copyright Copyright (C) 2011-2012 David Pennington
* @author David Pennington <http://xeoncross.com>
* @license http://www.opensource.org/licenses/mit-license.php
* @package PHPCompactor
*/
class PHPCompactor
{
// Array of all parser tokens (incase a method needs them)
public $tokens;
// Convert constant names to int values. Not cross-platform (or cross-version) safe!
//public $convert_constants = TRUE;
/**
* Load the given PHP code or token array for parsing
*
* @param string|object $class to compress and obfuscate
*/
public function __construct()
{
// Load all parser tokens incase a child class wants them
for ($i = 100; $i < 500; $i++)
{
if(($name = @token_name($i)) == 'UNKNOWN') continue;
$this->tokens[$i] = $name;
}
}
/**
* Obfuscate all functions by replacing long variable names
*
* @param string $source containing functions/classes
* @return string
*/
function obfuscate($code)
{
// This regex requires that functions are indented with tabs
$regex = '/\n\s*(\w+ ){0,2}function \w+.+?\n\t?}/is';
// We need to obfuscate and compress each function/method
return preg_replace_callback($regex, array($this, 'variable_replace'), $code);
}
/**
* Compress the function code by replacing variables
*
* @param string $source of function/method
* @return string
*/
function variable_replace($source)
{
$output = '';
$letters = range('a', 'z');
// Tokenize the method code so we can compress it correctly (then remove php tag)
$tokens = array_slice(token_get_all("<?php ". $source[0]), 1);
$variables = array();
foreach($tokens as $c)
{
if(is_array($c))
{
// Do not replace $this with a short name!
if($c[0] === T_VARIABLE AND $c[1] !== '$this')
{
if( ! isset($variables[$c[1]]))
{
// The first item of the difference is the value we use
$result = array_diff($letters, $variables);
$variables[$c[1]] = array_shift($result);
}
$c[1] = '$' . $variables[$c[1]];
}
$output .= $c[1];
}
else
{
$output .= $c;
}
}
return $output;
}
/**
* Remove unneeded code tokens such as comments and whitespace.
*
* @param string $code to mimimize
* @return string
*/
public function minimize($code)
{
$remove = array_flip(array(
T_END_HEREDOC,
//T_PRIVATE,
//T_PUBLIC,
//T_PROTECTED,
T_WHITESPACE, // "\t \r\n"
T_COMMENT, // // or #, and /* */ in PHP 5
T_DOC_COMMENT, // /** Docblock
T_BAD_CHARACTER,// anything below ASCII 32 except \t, \n and \r
//T_OPEN_TAG // < ?php open tag
));
$replace = array(
T_PRINT => 'echo',
T_LOGICAL_AND => '&&',
T_LOGICAL_OR => '||',
T_BOOL_CAST => '(bool)',
T_INT_CAST => '(int)',
);
$add_space_before = array_flip(array(
T_AS,
));
$add_space_after = array_flip(array(
T_CLASS,
T_CLONE,
T_CONST,
T_FINAL,
T_FUNCTION,
T_INSTANCEOF,
T_NAMESPACE,
T_NEW,
T_THROW,
T_STATIC,
T_PUBLIC,
T_PROTECTED,
T_PRIVATE,
T_USE
));
$add_space = array_flip(array(
T_EXTENDS,
T_IMPLEMENTS,
T_INTERFACE
));
$tokens = token_get_all($code);
foreach($tokens as $id => $token)
{
// Control characters
if( ! is_array($token)) continue;
list($code, $string, $line) = $token;
// Might be able to *shrink* some stuff
if(isset($replace[$code]))
{
$tokens[$id] = array($code, $replace[$code], $line);
continue;
}
// Remove some stuff
if(isset($remove[$code]))
{
unset($tokens[$id]);
continue;
}
// "function my_function()" = T_FUNCTION then T_WHITESPACE then T_STRING
if(isset($add_space[$code]))
{
$tokens[$id] = array($code, ' ' . $string . ' ', $line);
}
if(isset($add_space_before[$code]))
{
$tokens[$id] = array($code, ' ' . $string, $line);
}
if(isset($add_space_after[$code]))
{
$tokens[$id] = array($code, $string . ' ', $line);
}
// Look ahead for returnfunction() vs return$variables
if($code == T_RETURN)
{
// Is there a function two places ahead?
if(isset($tokens[$id + 2][0]))
{
$next = $tokens[$id + 2];
if($next[0] == T_STRING)
{
$tokens[$id] = array($code, $string . ' ', $line);
}
}
}
}
$output = '';
foreach($tokens as $id => $token)
{
// Control characters
if( ! is_array($token))
{
$output .= $token;
continue;
}
$output .= $token[1];
}
return $output;
}
}