PHP : Upload File

Question

I’m here with a problem making one upload of an XML file in PHP.

I have a form that allows me to select a file:

<form id="upload" action='' method='post' enctype="multipart/form-data" >
     <input id='uploaded_file' type='file' name='uploaded_file' title="Procurar ficheiro" /> 
     <input class="btn btn-primary" type="submit" name ="submitA_" value="Upload"/>
</form>

I have the code to read the file (through the DOM) and import the data to the BD:

$uploaded  = (object) $_FILES['uploaded_file']; //line 42
$import->dom->load( $uploaded->tmp_name );
$import->updateDB();

What happens is when the file is relatively large (9MB), the object $uploaded->tmp_name is left empty and, consequently, the upload for the comic book, below is the Warning of PHP:

Warning: Domdocument::load(): Empty string supplied as input on line 42

The $uploaded->error is NULL and the outcome of var_dump($uploaded); is:

Object(stdClass)#2 (0) { }

Note: No php.ini have upload_max_filesize = 128M and max_execution_time = 60

Answer 1

The problem is in PHP configuration (php.ini):

post_max_size = 8M

If the size of the posted data is greater than post_max_size then the superglobal $_POST and $_FILES are empty.

Here is the tip to check when you have problems uploading PHP files always check in php.ini:

• post_max_size - maximum size of the posted data

• upload_max_filesize - maximum file size

• memory_limit - memory limit

• max_execution_time - run time limit

• max_input_time - input time limit

Always bearing in mind that, the size of the post_max_size should be greater than upload_max_filesize. If memory limit is active in your script should be greater than post_max_size.

Based on response from the SOEN and in the PHP documentation

Answer 2

Initially I had not managed to reproduce its error, with its slightly adapted code. Here I got:

Domdocument::load(): I/O Warning : failed to load External Entity

Although it is a clear message from the point of view input/output doesn’t help much when the context is uploaded.

According to that bug reported, Domdocument::load() does not take into account the include_path which requires the path absolute be informed, which makes no sense since the value of this $_FILES input is already absolute.

For stubbornness, I passed the value to be informed to DOM by realpath(). Even though realpathhas not affected the data, that is, continued with path absolute correct, I was able to reproduce its error. Perhaps even because the DOM forces the cast for string ((string) FALSE) which generates an empty string.

I went after the temporary file and it did not exist (!). I re-sent the file, and it worked, but the file was still missing.

With all these problems, the only plausible and hitherto unforeseen-free solution was to go back to uploading files and REALLY upload the file.

Given the didactic case at hand, I didn’t care much for safety and I just did that:

if( $uploaded -> error == ERR_OK ) {

    move_uploaded_file( $uploaded -> tmp_name, './uploaded.xml' );
}

And I passed the file sent, here named uploaded.xml, for the FOD method:

$dom = new DOMDocument;

$dom -> load( './uploaded.xml' );