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<?php 
$tmp        =array();
$cartella   ='var/ciccio/palla';
$files      =glob($cartella.'/*.jpg');
foreach($files as $file){
    $tmp[filectime($file)]=$file;
    ksort($tmp,SORT_NUMERIC);
    }
$ultima_foto=array_pop($tmp);

echo $ultima_foto;
?>