[PHP] Compare Two Folders

I needed a simple changelog for one of my PHP projects. So I wrote a function that compares my current sourcecode against the nightly backup I make. This way I can relate support tickets from users to changes in my code and keep things organized.

Here's the code..

I needed a simple changelog for one of my PHP projects. So I wrote a function that compares my current sourcecode against the nightly backup I make. This way I can relate support tickets from users to changes in my code and keep things organized.

Here's the code..

<?php  
    Function Compare($current_sourcepath, $backup_sourcepath) {
        if ($handle = opendir($current_sourcepath)) {
            /* This is the correct way to loop over the directory. */
            $result = '';
            $ignore = array(".", "..", "exclude_me.php", "dynamic.php"); // stuff you want excluded
            while (false !== ($file = readdir($handle))) {
                if (!in_array($file, $ignore)) {
                    $current_file = $current_sourcepath.$file;
                    $backup_file = $backup_sourcepath.$file;
                    $display_file = basename($current_sourcepath.$file, ".php");
                    // COMPARE
                    if (!file_exists($backup_file)) $result .= "File added: $display_file<br>";
                    else {
                        $current_size = filesize($current_file);
                        $backup_size = filesize($backup_file);
                        $size_diff = $backup_size - $current_size;
                        if ($size_diff != 0) {
                            $current_lines = count(file($current_file));
                            $backup_lines = count(file($backup_file));
                            $lines_diff = $backup_lines - $current_lines;
                            $result .= "File changed: $display_file ($size_diff bytes / $lines_diff lines)<br>";
                        }    
                    }
                }    
            }
            closedir($handle);
        }
        return $result;
    }
    $changes = Compare ("pages/", "backup/pages/");
    $changes .= Compare ("modules/", "backup/modules/");
    echo "<h1>changelog</h1>$changes";
?>