Intrebare formular upload poze

Buna seara,

Am luat de pe net urmatorul cod:

$formate_valide = array("jpg", "png", "gif", "jpeg", "bmp");
$dimensiune_maxima = 1024*15000; //15 mb
$path = "poze_evenimente/"; // Upload directory
$contor = 0;
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
// Loop $_FILES to exeicute all files
foreach ($_FILES['files']['name'] as $f => $name) {	
	 if ($_FILES['files']['error'][$f] == 4) {
		 continue; // Skip file if any error found
	 }	   
	 if ($_FILES['files']['error'][$f] == 0) {		   
		 if ($_FILES['files']['size'][$f] > $dimensiune_maxima) {
			 $mesaj[] = "$name are mai mult de 15mb!.";
			 continue; // Skip large files
		 }
   elseif( ! in_array(pathinfo($name, PATHINFO_EXTENSION), $formate_valide) ){
	$mesaj[] = "$name nu este in format jpg, png, gif, bmp sau jpeg!";
	continue; // Skip invalid file formats
   }
		 else{ // No error found! Move uploaded files
			 if(move_uploaded_file($_FILES["files"]["tmp_name"][$f], $path.$name))
			 $contor++; // Number of successfully uploaded file
		 }
	 }
}
}

Problema sta astfel: Functioneaza perfect pana la 20 poze, la 21 respectiv 22 de poze imi urca primele 20 de poze si daca selectez 23+ poze imi da eroarea:

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respectiv

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Linia cu pricina fiind

foreach ($_FILES['files']['name'] as $f => $name) {	

As vrea sa stiu de unde apare aceasta problema si cum as putea rezolva.

Va multumesc