这个类可以比较两个目录中的文件，并找到改变。
它遍历两个目录检索的文件列表。
这个类可以列出哪些文件被添加，删除或更改。

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source = $source;
}

public function set_update($update) {
$this->update = $update;
}

public function get_source() {
return $this->source;
}

public function get_update() {
return $this->update;
}

public function get_removed() {
return $this->removed;
}

public function get_added() {
return $this->added;
}

public function get_changed() {
return $this->changed;
}

public function do_compare(){
 $source = Array();
 $destination = Array();
 $currentDirectory = getcwd();
 $workingDir = '';
chdir($this->source);
 $source = $this->doTree('.', $source);
 if (!is_array($source)) return;
 chdir ($this->update);
 $destination = $this->doTree('.', $destination);
 if (!is_array($destination)) exit;
chdir($currentDirectory);
 foreach ($source as $dir => $value) {
 foreach($value as $file => $hash) {
 if (isset($destination[$dir][$file])) {
 if ($hash != $destination[$dir][$file]) {
 $this->changed[] = $dir.'/'.$file;
}
 } else {
 $this->removed[] = $dir.'/'.$file;
}
}
}
 foreach ($destination as $dir => $value) {
 foreach($value as $file => $hash) {
 if (!isset($source[$dir][$file])) {
 $this->added[] = $dir.'/'.$file;
}
}
}
}

private function checksum($file) {
 $ignores = Array(10, 13);
 $fh = fopen($file, 'r');
 $buffer = '';
 while (!feof($fh)) {
 $buffer .= fgets($fh);
}
 fclose ($fh);
 foreach ($ignores as $ignore) {
 while (strpos($buffer, chr($ignore))) {
 $buffer = str_replace(chr($ignore), '', $buffer);
}
}
 return hash('crc32', $buffer).hash('crc32b', $buffer);
}

private function doTree($dir, &$array) {
 if (stripos($dir, 'checksum') !== false
 || stripos($dir, 'cache') !== false
 || stripos($dir, 'import') !== false
 || stripos($dir, 'custom') !== false
 || stripos($dir, '_notes') !== false
 || stripos($dir, '.svn') !== false) {
 return $array;
}
 $filetypes = Array('php', 'js', 'htm', 'html', 'css', 'tpl', 'ini', 'txt');
 if ($dh = opendir($dir)) {
 while ($file = readdir($dh)) {
 if ($file != '.' && $file != '..') {
 if (is_dir($dir.'/'.$file)) {
 if (count($array) == 0) $array[0] = 'Temp';
 if (!$this->doTree($dir.'/'.$file, $array)) {
 return false;
}
 } else {
 if (filesize($dir.'/'.$file)) {
 foreach ($filetypes as $type) {
 if (strpos($file.'|', '.'.$type.'|') != 0 ) {
set_time_limit(30);
 $array[$dir][$file] = $this->checksum( $dir.'/'.$file ); //md5_file($dir.'/'.$file, false);
}
}
}
}
}
}
 if (count($array) > 1 && isset($array['0'])) unset($array['0']);
 return $array;
 } else {
 echo 'error opening '.$dir.'';
 return false;
}
}

}

Upgrade checker
set_source($dir.'Source');// Directory where Source files are
 $cmp->set_update($dir.'Update');// Directory where pristeen files are
 $cmp->do_compare();// Do the compare
 $removed = $cmp->get_removed();// Get the results
 $added = $cmp->get_added();// ...
 $changed = $cmp->get_changed();// ...
 echo '
Files Changed
';// Display the results
 foreach($changed as $file) {
 echo $file.' has been changed
';
}
 echo '
Files Added
';
 foreach ($added as $add) {
 echo $add.'
';
}
 echo '
Files Removed
';
 foreach ($removed as $remove) {
 echo $remove.'
';
}

?>