Prova questo e vedi se funziona

Codice PHP:
<?php 

/**indica la cartella che contiene le img senza mettere / finale **/

$cartella_upload "cart"

function 
elencafiles($dirname){     
    
$arrayfiles=Array();     
    if(
file_exists($dirname)){         
        
$handle opendir($dirname);         
        while (
false !== ($file readdir($handle))) {              
                if(
is_file($dirname.$file)){                 
                        
array_push($arrayfiles,$file);             
                }         
            }         
            
$handle closedir($handle);     
        }     
        
sort($arrayfiles);     
        return 
$arrayfiles


$arrayfile=array(); 
$arrayfile=elencafiles("$cartella_upload/"); 

$num=count($arrayfile);


for(
$i=0;$i<$num;$i++)
{
echo 
"\"".$arrayfile[$i]."\"";
if(
$i!=$num-1){echo ",";}
}


?>