Put outside array .
$random = md5(rand()).".jpg";
$image = preg_replace('#^data:image/[^;]+;base64,#', '', $data['image']);
file_put_contents($random,base64_decode($image)) ;
$nonerejected[] = array(
'id' => $data['id'],
'storename' => $data['storename'],
'notes' => $data['notes'],
'image' => $random,
);
}