Why codeigniter force download() incorrectly transforms the string of the archive to be downloaded?

Hi Experts!

Could you explain why codeigniter code:

 $this->load->helper('download');
 force_download($arquivo, "Ebook");

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Tranforms the string:
$arquivo = "http://localhost/codeagro/arquivos/cesans/e_pub/Livro_melhor_alimento_ebook_2015.epub"

And produces this download (putting  "_ "  incorrectly in the string), accordingly with the picture
img_001
What must be done to correct it ?

Thanks in advance!
Eduardo FuerteDeveloper and AnalystAsked:
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Dave BaldwinFixer of ProblemsCommented:
Maybe you can only download from the host that you're on, try removing the 'http://localhost/' part of the string.
$arquivo = "codeagro/arquivos/cesans/e_pub Livro_melhor_alimento_ebook_2015.epub"

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Julian HansenCommented:
https://ellislab.com/codeigniter/user-guide/helpers/download_helper.html
force_download($name, $data);

The first parameter is what you want the document to be called when it is saved on the other end

$arquivo = "http://localhost/codeagro/arquivos/cesans/e_pub/Livro_melhor_alimento_ebook_2015.epub"

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Is full of illegal characters that are not valid in most filesystems - so the helper is "helping" you by replacing those non-valid characters with '_' so that when you save the file the OS does not choke on the file name.

Try
$arquivo = 'sample_filename.epub';

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Having said that - your $data element does not look right - your download (if I read the docs correctly) is going to comprise a file (with that long and ugly modified name) with the content Ebook. If you want the file to be the actual EBook yhou would need to do this
$data = file_get_contents('codeagro/arquivos/cesans/e_pub/Livro_melhor_alimento_ebook_2015.epub');
$name = 'sample_ebook.epub';
force_download($filename, $data);

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I suspect you read the docs
force_download('filename', 'data')
To mean the first parameter was the path to the file - when in fact the second parameter is for the data - while the first parameter is for the name you want the file to be saved as on the other side.
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Eduardo FuerteDeveloper and AnalystAuthor Commented:
Very, very good assistanece!

Problem solved.

Thank you very much, Julian!
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Julian HansenCommented:
You are most welcome Eduardo,
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