Description:
------------
When using CURLOPT_FILE, file position indicator stays in the end when the handle is a temporary stream. However the indicator is rewinded to 0 when the handle is a regular file (which seems to be a wrong behaviour).

Tested in PHP 7.0.5 and 5.6.20.

Test script:
---------------
<?php

function test($filename) {
	echo $filename, PHP_EOL;
	$fh = fopen($filename, 'w');

	$curl = curl_init('http://php.net/');
	curl_setopt($curl, CURLOPT_FILE, $fh);
	curl_exec($curl);

	echo ' fstat size: ', fstat($fh)['size'], PHP_EOL;
	echo ' ftell: ', ftell($fh), PHP_EOL;
}

test('regular-file.tmp');
test('php://temp');


Expected result:
----------------
regular-file.tmp
 fstat size: 19371
 ftell: 19371
php://temp
 fstat size: 19371
 ftell: 19371


Actual result:
--------------
regular-file.tmp
 fstat size: 19371
 ftell: 0
php://temp
 fstat size: 19371
 ftell: 19371