diff.function.php

<?PHP
        function diff ($old,$new,$nret = true,$inline = false) {
//              if ($inline) {
//                      return str_replace(array("\n",chr(92).chr(92),'\n'),array(' ',chr(92),"\n"),diff(implode("\n",explode(' ',str_replace(array(chr(92),"\n"),array(chr(92).chr(92),'\n'),$old))),implode("\n",explode(' ',str_replace(array(chr(92),"\n"),array(chr(92).chr(92),'\n'),$new))),$nret,false));
//              }
                $file1 = tempnam('/tmp','diff_');
                $file2 = tempnam('/tmp','diff_');
                file_put_contents($file1,$old);
                file_put_contents($file2,$new);
                $out = array();
                if ($inline) {
//                      echo 'EXEC: wdiff -3'.(($nret)?'1':'2').' '.escapeshellarg($file1).' '.escapeshellarg($file2)."\n";
                        @exec('wdiff -3'.(($nret)?'1':'2').' '.escapeshellarg($file1).' '.escapeshellarg($file2),$out);
                        foreach ($out as $key => $line) {
                                if ($line == '======================================================================') unset($out[$key]);
                                elseif ($nret) $out[$key] = '> '.$line;
                                else $out[$key] = '< '.$line;
                        }
                } else {
                        @exec('diff -d --suppress-common-lines '.escapeshellarg($file1).' '.escapeshellarg($file2),$out);
                }
                $out2 = array();
                foreach ($out as $line) {
                        if (
                                (
                                        ($nret)
                                        and (preg_match('/^\> .*$/',$line))
                                )
                                or (
                                        (!$nret)
                                        and (preg_match('/^\< .*$/',$line))
                                )
                        ) {
                                $out2[] = substr($line,2);
                        }
                }
                $out = $out2;
                unset($out2);
                unlink($file1);
                unlink($file2);
                return implode("\n",$out);
        }
?>