Check if input file is filled

Question

I am having a difficulty that I am not able to solve, even if it is a simple situation. I am trying to validate a field input file, the field needs to be filled in, which I have:

Form:

<form enctype="multipart/form-data" class="form-horizontal" id="frmDoc" method="post">

<legend>Selecione o PDF</legend>
<div class="form-group">
  <label class="col-md-2 control-label">Arquivo</label>
  <div class="col-md-10">
    <input name="Arquivo" type="file" class="btn btn-default" id="Arquivo">
    <p class="help-block"> Extensão permitida <strong>PDF</strong>. </p>
  </div>
</div>

Validation attempt:

if (!isset($_FILES)):
    $retorno = array('codigo' => 0, 'mensagem' => ' Informe o arquivo para Upload');
    echo json_encode($retorno);
    exit();
endif;

The script is running even without informing the file.

Answer 1

You can do it like this:

if ($_FILES['Arquivo']['error'] == 4):
    $retorno = array('codigo' => 0, 'mensagem' => ' Informe o arquivo para Upload');
    echo json_encode($retorno);
    exit();
endif;

The problem was in the verification, because isset($_FILES) it’s always true, $_FILES always exists, even if it is empty. What I did above was to check whether within that array there is Arquivo defined in the form.

More about upload errors

I also advise you to do a customer side check, with required:

<input name="Arquivo" type="file" class="btn btn-default" id="Arquivo" required>

Answer 2

You can check the file size. If it’s 0 it’s because it wasn’t uploaded.

if ($_FILES['Arquivo']['size'] == 0)