The file was not uploaded due to an unknown error - php

Question

I am trying to upload same image for multiple students. It works for first one but for next one it gives error.
my code
foreach($student_ids as $key => $student_id) {
$fileIds='';
if(Input::hasfile('attachment')){
$comment = $comments[0];
$file = Input::file('attachment');
$destinationPath = public_path().'/uploads/moments/'.$student_id;
$filename = "moment_".time()."_".trim(rand(1,999)).".".$file->getClientOriginalExtension();
if(is_dir($destinationPath)) {
$upload_success = $file->move($destinationPath, $filename);
}else {
if(mkdir($destinationPath)) {
$upload_success = $file->move($destinationPath, $filename);
}
}
$file = Moment_gallery::create(['image'=>$filename,'comment'=>$comment]);
$fileIds.=$file->id.',';
}
$moments = new moment();
$moments->activity_id = $activity;
$moments->type=$activity_type;
$moments->student_id=$student_id;
$moments->date = $date;
$moments->time = $activity_time ? $activity_time : ' ';
$moments->save();
}
here i am getting array of multiple students id... So i am just uploading same image for those students. It works for single student but then for multiple students it works for first one and give error for second one as
FileException in UploadedFile.php line 235:The file "student.png" was not uploaded due to an unknown error.
whats wrong..? Thank you.

Answer 1

$file = Input::file('attachment');
Understanding that $file is of object type:
Illuminate\Http\UploadedFile
and that it's pointing at the file on the server, e.g.
e‌‌cho $file->getRealPath(); // ‌/tmp/phpp6HYIk
then you can see that by performing:
$file->move($dest_path);
you're moving the file away from it's original destination thereby making it unavailable for subsequent iterations.