Description:
------------
stream_context_create  post content bug.
sometime the post data is excessive four bytes than 'content'

Reproduce code:
---------------
$url="http://192.168.0.110:6633/1.php";
$log_str="a=b&c=d";
$ret=micat_post($url,$log_str);
function micat_post($url,$content) {

	$content_length = strlen($content);
	$options = array(
	'http'=>array(
	'method' => 'POST',
	'header' =>"Content-type:                application/x-www-form-urlencoded\r\n" . 
	"Content-length: $content_length\r\n".
	"Command-length: $content_length\r\n",
	'content' => $content
	)
	);
	$context = stream_context_create($options);
	$response = file_get_contents($url, false, $context);
	
}

Expected result:
----------------
the send data should be "a=b&c=d" but by using snort ,i found the send data is ""a=b&c=d\r\n\r\n"

Actual result:
--------------
more foue bytes than content