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function reArrayFiles($file)
{
$file_ary = [];
$file_count = count($file['name']);
$file_key = array_keys($file);

for($i=0;$i<$file_count;$i++)
{
    foreach($file_key as $val)
    {
        $file_ary[$i][$val] = $file[$val][$i];
    }
}
return $file_ary;
}


if(!empty($_FILES['img'])){

$img = $_FILES['img'];
$img_desc = reArrayFiles($img);

$event=mb_substr(sha1(date('YmdHis')), 0,5);
$directory="img/"."$event"."/";
mkdir($directory,0777,true);
chmod($directory, 0777);

foreach($img_desc as $val)
{
    $newname =
mb_substr(sha1(date('YmdHis',time()).mt_rand()),0,7).'.jpg';
    move_uploaded_file($val['tmp_name'],$directory.$newname);
    chmod($directory.'/'.$newname, 0777);
    }
}


<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form method="post" action="formfiles.php" enctype="multipart/form-
data">
file :  <input type="file" name="img[]" multiple>
<input type="submit"  />
</form>

</body>
</html>