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  1. PO
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    <p>Thanks very much for the suggestions to check the error logs, I had somehow missed an out of memory error I was getting.</p> <p>The problem was in fact caused by the way I was using the <a href="http://www.yiiframework.com/doc/api/1.1/CActiveDataProvider/" rel="nofollow">CActiveDataProvider</a> from the Yii Framework. Reading straight from the DataProvider as I was doing in my question was reading each row into memory, as the script ran on this meant I eventually ran out of memory available to PHP.</p> <p>There are a couple of ways to fix this, one is to set pagination on the dataprovider to a smaller number of records and to manually iterate over the data, loading only the pagesize into memory each iteration.</p> <p>The option I went for is to use a <a href="http://www.yiiframework.com/doc/api/1.1/CDataProviderIterator" rel="nofollow">CDataProviderIterator</a> to handle this for me <code>$iterator = new CDataProviderIterator($dp);</code> this prevents memory filling up with the records I'm retrieving. </p> <p>Note that I also had to add an <code>ob_flush();</code> call to prevent the output buffer from filling up with the CSV contents iteslf.</p> <p>For reference I ended up with the following:</p> <pre><code>&lt;?php header('Content-type: text/csv'); header('Content-Disposition: attachment; filename="vacancies.csv"'); set_time_limit(240); $outstream = fopen("php://output", 'w'); $headings = array( $vacancy-&gt;getAttributeLabel('vacancy_id'), ... ); fputcsv($outstream, $headings, ',', '"'); $iterator = new CDataProviderIterator($dp); // create an iterator instead of just using the dataprovider foreach($iterator as $vacancy){ // use the new iterator here $row = array( $vacancy-&gt;vacancy_id, ... ); fputcsv($outstream, $row, ',', '"'); ob_flush(); // explicitly call a flush to avoid filling the buffer } fclose($outstream); ?&gt; </code></pre> <p>Would not have thought to go back and look at the logs again without the suggestion so many thanks :)</p>
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    1. POPHP - Zero length (empty) CSV but only for larger datasets
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    1. USJonny
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    1. COIncidentally, there's absolutely nothing wrong with accepting your own answer, especially when it provides a good level of detail such as this.
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      1. USJohn Parker
    2. COThanks, I wasn't able to accept it until now as my account is fairly new. Have done so now :)
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