why three quotation coming in fopen, """aaaa""","""bbb"""
<p>it is an example of fopen</p>

<pre><code>&lt;?php

$list = array (
    array('aaa', 'bbb', 'ccc', 'dddd'),
    array('123', '456', '789'),
    array('"aaaa"', '"bbb"')
);

$fp = fopen('file.csv', 'w');

foreach ($list as $fields) {
    fputcsv($fp, $fields);
}

fclose($fp);
?&gt;
</code></pre>

<p>it's output is</p>

<pre><code>aaa,bbb,ccc,dddd
123,456,789
"""aaaa""","""bbb"""
</code></pre>

<p>can any one say me why in """aaaa""","""bbb""" why three quotation in place of one.</p>
