[patch release] Place category in the Forums header, save space

<?php
/**
 * PunBB Patch: Place category in the Forums header instead of using extra vertical space.
 * This means that category headers will be collapsed - the category is shown before 'Forums' instead.
 * The line 'Forums,...Topics,.., Posts,...' becomes 'CATEGORY Forums,...Topics,.., Posts,...'
 * ---------------------------------------------
 * Patch is compatible at least with PunBB 1.3.4
 * Important: Needs write permissions for index.php
 * A backup of index.php is created automatically
 * HowToUse: Place this in the same directory as index.php, then open (execute) it.
 * Patch uses NC-patch-engine v1.1
 */

//files
$file_to_patch = 'index.php';
$file_backup = 'index.php.bak';

//patches
$patches[0]['pattern'] = '/<h2 class=\"hn\"><span><\?php echo forum_htmlencode\(\$cur_forum\[\'cat_name\'\]\)/i';
$patches[0]['replacement'] = '<h2 class="hn" style="display:none"><span><\?php echo forum_htmlencode($cur_forum[\'cat_name\'])';
$patches[1]['pattern'] = '/<strong class=\"subject-title\">\'\.\$lang_index\[\'Forums\'\]/i';
$patches[1]['replacement'] = '<strong class="subject-title">\'.$cur_forum["cat_name"].\' \'.$lang_index["Forums"]';






$error = 0;
//does patch target exist
if (!file_exists($file_to_patch)){
    echo 'Cannot find index.php - patch failed!';
    exit;
}

//try to make a backup
$backup = file_get_contents($file_to_patch);
try{
    if (!file_exists($file_backup))
        file_put_contents($file_backup, $backup);
}catch(Exception $e){;}

//make sure backup exists
if (!file_exists($file_backup)){
    echo 'Could not write backup file '.$file_backup.' Patch abortet. Nothing has been modified!';;
    exit;
}

//do the patch work
$matches = 0;
$array_of_lines = explode("\n", file_get_contents($file_to_patch));
$num_lines = count($array_of_lines);
try{
    for ($i = 0; $i < $num_lines; $i++)
    {
        $k = 0;
        while(isset($patches[$k])){
            if (preg_match($patches[$k]['pattern'], $array_of_lines[$i], $results)) {
                $matches++;
                $array_of_lines[$i] = preg_replace($patches[$k]['pattern'], $patches[$k]['replacement'], $array_of_lines[$i]);
            }
            $k++;
        }
    }
}catch(Exception $e){$error++;}

//write patched bytes back to file
try{
    if(!$error)
        file_put_contents($file_to_patch, implode("\n", $array_of_lines));
}catch(Exception $e){$error++;}

//give the user something to read
echo (!$error && $matches) ? $matches.' lines have been patched. Now try the modified file.' : 'File already patched or wrong version of '.$file_to_patch.'. Nothing has been modified!'

?>