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POHow to download a temporary file
 

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    <p>I'm trying to create a short PHP script that takes a JSON string, converts it to CSV format (using <code>fputcsv</code>), and makes that CSV available as a downloaded .csv file. My thought was to use <code>tmpfile()</code> to not worry about cronjobs or running out of disk space, but I can't seem to make the magic happen.</p> <p>Here's my attempt, which is a converted example from <a href="http://php.net/manual/en/function.readfile.php#refsect1-function.readfile-examples" rel="noreferrer">the PHP docs of <code>readfile</code></a>:</p> <pre><code>$tmp = tmpfile(); $jsonArray = json_decode( $_POST['json'] ); fputcsv($tmp, $jsonArray); header('Content-Description: File Transfer'); header('Content-Type: text/csv'); header('Content-Disposition: attachment; filename='.basename($tmp)); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($tmp)); ob_clean(); flush(); readfile($tmp); </code></pre> <p>I feel like the <code>Content-Disposition</code> and <code>Content-Transfer-Encoding</code> headers are wrong, but I'm not sure how to fix them. For example, <code>basename($tmp)</code> doesn't seem to return anything, and I'm not sure <code>text/csv</code> transfers as binary encoding. Likewise, <code>echo filesize($tmp)</code> is blank as well. Is there a way to do what I'm attempting here?</p> <p><strong>[Edit]</strong></p> <p>**Below is the working code I wrote as a result of the accepted answer:*</p> <pre><code>$jsonArray = json_decode( $_POST['json'], true ); $tmpName = tempnam(sys_get_temp_dir(), 'data'); $file = fopen($tmpName, 'w'); fputcsv($file, $jsonArray); fclose($file); header('Content-Description: File Transfer'); header('Content-Type: text/csv'); header('Content-Disposition: attachment; filename=data.csv'); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($tmpName)); ob_clean(); flush(); readfile($tmpName); unlink($tmpName); </code></pre>
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    1. COFor a javascript solution to this problem, take a look at http://stackoverflow.com/questions/4130849/convert-json-format-to-csv-format-for-ms-excel.
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    2. CODoes `json_decode` return `null` by any chance?
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    3. COSo the file is just do not want to be downloaded? and opened in browser? that is the problem?
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