static public function checkDir($dir = false) {

if(is_dir($dir)) {

if(!is_writable($dir)) {

exit("'$dir' must be writable!");

}

} else {

mkdir($dir, 0777, true);

}

}

static public function delTree($dir) {

$files = array_diff(scandir($dir), array('.','..'));

foreach ($files as $file) {

(is_dir("$dir/$file")) ? self::delTree("$dir/$file") : unlink("$dir/$file");

}

return rmdir($dir);

}

static public function translit($string) {

$charlist = array(

"А"=>"A","Б"=>"B","В"=>"V","Г"=>"G",

"Д"=>"D","Е"=>"E","Ж"=>"J","З"=>"Z","И"=>"I",

"Й"=>"Y","К"=>"K","Л"=>"L","М"=>"M","Н"=>"N",

"О"=>"O","П"=>"P","Р"=>"R","С"=>"S","Т"=>"T",

"У"=>"U","Ф"=>"F","Х"=>"H","Ц"=>"TS","Ч"=>"CH",

"Ш"=>"SH","Щ"=>"SCH","Ъ"=>"","Ы"=>"YI","Ь"=>"",

"Э"=>"E","Ю"=>"YU","Я"=>"YA","а"=>"a","б"=>"b",

"в"=>"v","г"=>"g","д"=>"d","е"=>"e","ж"=>"j",

"з"=>"z","и"=>"i","й"=>"y","к"=>"k","л"=>"l",

"м"=>"m","н"=>"n","о"=>"o","п"=>"p","р"=>"r",

"с"=>"s","т"=>"t","у"=>"u","ф"=>"f","х"=>"h",

"ц"=>"ts","ч"=>"ch","ш"=>"sh","щ"=>"sch","ъ"=>"y",

"ы"=>"yi","ь"=>"","э"=>"e","ю"=>"yu","я"=>"ya"," "=>"_"

);

return strtr($string,$charlist);

}

static public function recursiveFilename($path, $filename, $ext, $i=false) {

$add = $i ? "_".$i : "";

if(file_exists($path.$filename.$add.".".$ext)) {

$i ? $i++ : $i=1;

return self::recursiveFilename($path, $filename, $ext, $i);

} else {

return $filename.$add.".".$ext;

}

}

static public function base_encode($num, $alphabet = "23456789abcdefghijkmnpqrstuvwxyz") {

$base_count = strlen($alphabet);

$encoded = '';

while ($num >= $base_count) {

$div = $num/$base_count;

$mod = ($num-($base_count*intval($div)));

$encoded = $alphabet[$mod] . $encoded;

$num = intval($div);

}

if ($num) $encoded = $alphabet[$num] . $encoded;

return $encoded;

}

static public function uniqHash($table, $field="hash") {

$hash = self::base_encode(mt_rand(10000000, 99999999));

$exist = DB::getCell("SELECT 1 FROM $table WHERE $field=:field LIMIT 1", [':field' => $hash]);

if($exist) {

self::uniqHash($table, $field);

} else {

return $hash;

}

}

static public function paginator($sql, $klvo = 10, $pnum = 9, $bind_params = []) {

$page = HTTP::$page;

$layout = $klvo * ($page - 1);

$sql_num = preg_replace('|SELECT(.*?)FROM|s', "SELECT 1 FROM", $sql);

$sql = str_replace(";","",$sql);

$sql = preg_replace('/LIMIT(.*?)$/Uis', "", $sql);

$sql .= " LIMIT $layout, $klvo;";

$rows = DB::getCol($sql_num, $bind_params);

$num_rows = sizeof($rows);

unset($rows);

$pages = ceil($num_rows/$klvo)+1;

$url_params = explode("?", $_SERVER['REQUEST_URI']);

$url = preg_replace('/page-(.*?)$/Uis', "", $url_params[0]);

if( strpos($url, '/', strlen($url)-1) ) {

$url = substr($url, 0, -1);

}

$pos = floor($pnum/2); //Get pages num before and after current page

if($page <= $pos) { //if curent page in the begining, crop last page by pages number

$start_page = 1;

$end_page = $pages < $pnum ? $pages : $pnum;

} else {

$start_page = $page - $pos;

$end_page = $pages < ($start_page + $pnum) ? $pages : $start_page + $pnum;

}

$tpl = App::get('view');

$tpl->assign('page_items', $num_rows);

$tpl->assign('page_from', $layout+1);

$tpl->assign('page_to', $layout+$klvo>=$num_rows ? $num_rows : $layout+$klvo);

if($pages > 2) {

$tpl->assign('page_url', $url);

$tpl->assign('page_url_get', !empty($url_params[1]) ? "?" . $url_params[1] : "");

$tpl->assign('start_page', $start_page);

$tpl->assign('end_page', $end_page);

$tpl->assign('page', $page);

$tpl->assign('pages', 1);

$tpl->assign('pages_num', $pages);

}

return $sql;

}

static public function formatBytes($bytes, $precision = 2) {

$units = array('б', 'Кб', 'Мб', 'Гб', 'Тб');

$bytes = max($bytes, 0);

$pow = floor(($bytes ? log($bytes) : 0) / log(1024));

$pow = min($pow, count($units) - 1);

// Uncomment one of the following alternatives

$bytes /= pow(1024, $pow);

// $bytes /= (1 << (10 * $pow));

return round($bytes, $precision) . ' ' . $units[$pow];

}