function kurz($cena)
{	global $db;
	$b1=mysqli_query($db,"SELECT * FROM pracovni.kurz order by id desc limit 1"); 
	$kurz = mysqli_fetch_assoc($b1); 
    $cena=round($cena/$kurz["euro"],2); 
	return $cena;
}


 function nastav_datum_minus($newdate){
 	$date = new DateTime($newdate);
     $date->modify("-21 day");
     return $date->format("Y-m-d");
 }
 function nastav_datum($newdate){
 	$date = new DateTime($newdate);
     $date->modify("+21 day");
     return $date->format("Y-m-d");
 }
 
 function posta($postovne,$totalcena,$minobj) { 
   if ($totalcena>$minobj or $totalcena==0) $postovne=0;
  return $postovne;
 } 
 
function KosikId() {
         if(isset($_COOKIE["KosikId"])) { return $_COOKIE["KosikId"]; } else
           { setcookie("KosikId", session_id(), time() + ((3600 * 24) * 30)); return session_id(); }
}
function oddel_tisice($cislo)
{
  $oddeleno = number_format($cislo, 2, ',', ':');
  return str_replace(':', '<span class="tisic"></span>', $oddeleno);
}



function dopln_do_url($url){
 $uri_parts=array();
 $uri_parts = explode('?', $_SERVER['REQUEST_URI'], 2);
 $uri_parts[]=$url;
 parse_str($url, $par_url);
  echo $par_url[0];
  
 //if ($uri_parts) return  "cesta=?".implode("&",$uri_parts);
 return "index1.php?".dopln_url()."&$url";
 
}

function dopln_url(){
	$rawurl=str_replace("-"," ",rawurldecode($_SERVER['REQUEST_URI']));
  //  $rawurl=trim(str_replace("/","",$rawurl));
	$uri_parts = explode('?', $rawurl, 2);
    if (isset($uri_parts[1])) return  str_replace("-"," ",$uri_parts[1]);
    
}
function upravlink($url){
	//if(substr($url,0,1)=="-")$url=trim(substr($url,1));
	 	$c=explode("-",$url);
    	$url1=array();
    	for($i=0;$i<count($c);$i++){  if ($c[$i]) $url1[]=trim($c[$i]); }
    	$qa=implode("-",$url1);
    	if (dopln_url()) $qa.="?";
    	$qa.=dopln_url();
 	return $qa;
	
}

function nastavurl($url) {
	$url=trim($url);
	//$url=mb_convert_case($url, MB_CASE_LOWER , "UTF-8");
	$url = StrTr($url,"ÁÄÈÇÏÉÌËÍÒÓÖØŠ�ÚÙÜÝŽáäèçïéìëíòóöøš�úùüýž&/.+´(),","AACCDEEEINOORSTUUUYZaaccdeeeinoorstuuuyz--------"); 
    	$url=Strtolower($url);
    	$url=StrTr($url, " ", "-");
    	$url=StrTr($url, "&", "-");
    	$c=explode("-",$url);
    	$url1="";
    	for($i=0;$i<count($c);$i++){  if ($c[$i]) $url1.=trim($c[$i])."-";   }
    	$url=substr($url1,0,-1);
 	return $url;
}


function getUrlWithout($getNames){	
	list($p1,$p2)=explode("=",$getNames);
	
	$getNames=array($p1);
      $url = rawurldecode("http" . ((!empty($_SERVER['HTTPS'])) ? "s" : "") . "://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI']);
      $questionMarkExp = explode("?", $url);
    if(isset($questionMarkExp[1]))  $urlArray = explode("&", $questionMarkExp[1]); else $urlArray = array();
      $retUrl=$questionMarkExp[0];
      $retGet="";
      $found=array();
      foreach($getNames as $id => $name){
            foreach ($urlArray as $key=>$value){
                if(isset($_GET[$name]) && $value==$name."=".$_GET[$name])
                    unset($urlArray[$key]);
          }
      }
    if ($p2) $urlArray[]=$p1."=".$p2;
      $urlArray = array_values($urlArray);
      foreach ($urlArray as $key => $value){
          if($key<sizeof($urlArray) && $retGet!=="")
              $retGet.="&";
          $retGet.=$value;
      }
      if($retGet) $retUrl="?".$retGet;
      return str_replace(" ","-",$retUrl);
  }
 
  
  function blok_trideni($pocet){ 
  	global $seradit;
 	echo " <ul><li>Produktù: <span><b>$pocet</b></span></li></ul>
 	<ul class='blok_trideni'><li>
 	Øadit dle ceny <a href='".getUrlWithout("seradit=cena-asc")."'><img src='$link/img/dir-asc.gif'></a>
 	<a href='".getUrlWithout("seradit=cena-desc")."'><img src='$link/img/dir-desc.gif'></a></li></ul>";
 	echo "<ul>";
 	$set="";
 	if ($seradit=="novinky") $set="class='active'";
 	if ($seradit=="novinky") $nx1=""; else $nx1="=novinky"; echo "<li><a $set href='".getUrlWithout("seradit".$nx1)."'>Novinek</a></li>";
 	
 	$set="";
 	if ($seradit=="skladem") $set="class='active'";
 	if ($seradit=="skladem") $nx2=""; else $nx2="=skladem"; echo "<li><a $set href='".getUrlWithout("seradit".$nx2)."'>Skladem</a></li></ul>";
 }
 
 
 
 
     function replace_img_src($original_img_tag, $new_src_url) {
    $doc = new DOMDocument();
    $doc->loadHTML($original_img_tag);
    $tags = $doc->getElementsByTagName('img');
    if(count($tags) > 0)
    {
           $tag = $tags->item(0);
           $a=$tag->attributes->getNamedItem("src")->value;
    	   $tag->setAttribute('srcset', $a);
           $tag->setAttribute('src', $new_src_url);
           $tag->setAttribute('class', "produkt-lazy");
           return $doc->saveHTML($tag);
    }
    return false;
}
function replace_my_string($original, $new, $text) {
 $doc = str_replace($original, $new, $text);
 return $doc;  
}

function ImgWebp($adresar,$img){
    $subDirName = substr(basename($img), 0, 3);
	$newImage = "https://www.hotdiamonds.cz/photos/$adresar/" . $subDirName . "/" .
    preg_replace('/\.[^.]+$/', '.webp', basename($img));
	return $newImage;
}