Multiple Upload sometimes doesn't uploaded successfully - php

Question

I have a function to upload multiple files, but sometimes file(s) is not uploaded but path is successfully added to database. i am not sure what is the ptoblem. i use function 'times()' to make it unique is this the root of the problem ?
i already tested it and it work successfully, but when its implemented sometimes the file doesnt uploaded successfully
if ($_FILES["lampiran"]["name"] != NULL) {
$config = array();
$ext = array();
$records = array();
$file_name = "Plan_".time();
$files = $_FILES['lampiran'];
$config['upload_path'] = "./uploads/Planning/attachment";
$config['allowed_types'] = '*';
foreach ($_FILES['lampiran']['name'] as $key => $value) {
$ext[]= pathinfo($_FILES['lampiran']['name'][$key], PATHINFO_EXTENSION);
}
$cpt = count ($_FILES['lampiran']['tmp_name']);
for($i=0; $i<$cpt; $i++){
$_FILES['lampiran']['name']= $file_name.$i.'.'.$ext[$i];
$_FILES['lampiran']['type']= $files['type'][$i];
$_FILES['lampiran']['tmp_name']= $files['tmp_name'][$i];
$_FILES['lampiran']['error']= $files['error'][$i];
$_FILES['lampiran']['size']= $files['size'][$i];
$records[] = $config['upload_path'].'/'.$_FILES['lampiran']['name'];
$this->upload->initialize($config);
if ( ! $this->upload->do_upload('lampiran'))
{
$error = array('error' => $this->upload->display_errors());
print_r($error);
// $this->load->view('upload_form', $error);
}
}
$pile = implode(";", $records);
} else {
$pile = NULL;
}

Answer 1

Use $records in else condition also make error array than, Like
if ( ! $this->upload->do_upload('lampiran'))
{
$error[] = $this->upload->display_errors();
}else{
$upload_data = $this->upload->data();
$records[] = $config['upload_path'].'/'.$upload_data['file_name'];
}
Here you will get all errors in $error and uploaded files in records.