public function getDiff($old, $new, $granularity = null)
{
$granularity = $granularity ? $this->getGranularity($granularity) : $this->defaultGranularity;
$opcodes = FineDiff::getDiffOpcodes($old, $new, $granularity);
$html = FineDiff::renderDiffToHTMLFromOpcodes($old, $opcodes);
return $html;
}
if (!empty($_POST['from']) || !empty($_POST['to'])) {
if (!empty($_POST['from'])) {
$from_text = $_POST['from'];
}
if (!empty($_POST['to'])) {
$to_text = $_POST['to'];
}
}
// limit input
$from_text = substr($from_text, 0, 1024 * 100);
$to_text = substr($to_text, 0, 1024 * 100);
// ensure input is suitable for diff
$from_text = mb_convert_encoding($from_text, 'HTML-ENTITIES', 'UTF-8');
$to_text = mb_convert_encoding($to_text, 'HTML-ENTITIES', 'UTF-8');
$granularityStacks = array(FineDiff::$paragraphGranularity, FineDiff::$sentenceGranularity, FineDiff::$wordGranularity, FineDiff::$characterGranularity);
$diff_opcodes = FineDiff::getDiffOpcodes($from_text, $to_text, $granularityStacks[$granularity]);
$diff_opcodes_len = strlen($diff_opcodes);
$exec_time = gettimeofday(true) - $start_time;
if ($diff_opcodes_len) {
$data_key = sha1(serialize(array('granularity' => $granularity, 'from_text' => $from_text, 'diff_opcodes' => $diff_opcodes)));
$filename = "{$data_key}{$compressed_serialized_filename_extension}";
if (!file_exists("./cache/{$filename}")) {
// purge cache if too many files
if (!(time() % 100)) {
$files = glob("./cache/*{$compressed_serialized_filename_extension}");
$num_files = $files ? count($files) : 0;
if ($num_files > $cache_hi_water_mark) {
$sorted_files = array();
foreach ($files as $file) {
$sorted_files[strval(@filemtime("./cache/{$file}")) . $file] = $file;
}
