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stream_get_meta_data (PHP 4 >= 4.3.0, PHP 5) stream_get_meta_data -- Retrieves header/meta data from streams/file pointers Descriptionarray stream_get_meta_data ( resource stream )
Returns information about an existing stream.
The stream can be any stream created by fopen(),
fsockopen() and pfsockopen().
The result array contains the following items:
timed_out (bool) - TRUE if the stream
timed out while waiting for data on the last call to
fread() or fgets().
blocked (bool) - TRUE if the stream is
in blocking IO mode. See stream_set_blocking().
eof (bool) - TRUE if the stream has reached
end-of-file. Note that for socket streams this member can be TRUE
even when unread_bytes is non-zero. To
determine if there is more data to be read, use
feof() instead of reading this item.
unread_bytes (int) - the number of bytes
currently contained in the PHP's own internal buffer.
Замечание:
You shouldn't use this value in a script.
The following items were added in PHP 4.3:
stream_type (string) - a label describing
the underlying implementation of the stream.
wrapper_type (string) - a label describing
the protocol wrapper implementation layered over the stream.
See Прил. M for more information about wrappers.
wrapper_data (mixed) - wrapper specific
data attached to this stream. See Прил. M for
more information about wrappers and their wrapper data.
filters (array) - and array containing
the names of any filters that have been stacked onto this stream.
Documentation on filters can be found in the
Filters appendix.
Замечание:
This function was introduced in PHP 4.3, but prior to this version,
socket_get_status() could be used to retrieve
the first four items, for socket based streams only.
In PHP 4.3 and later,
socket_get_status() is an alias for this function.
Замечание: This function does NOT work on sockets created by the Socket extension.
The following items were added in PHP 5.0:
mode (string) - the type of access required for
this stream (see Table 1 of the fopen() reference)
seekable (bool) - whether the current stream can
be seeked.
uri (string) - the URI/filename associated with this
stream.
 add a note
User Contributed Notes
stream_get_meta_data
ed at readinged dot com
28-Jan-2003 07:54
Below is a function I wrote to pull the "Last-Modified" header from a given URL. In PHP version 4.3 and above, it takes advantage of the stream_get_meta_data function, and in older version it uses a conventional GET procedure. On failure to connect to $url, it returns NULL. If the server does not return the Last-Modified header, it returns the current time. All times are returned in PHP's integer format (seconds since epoch).
Use it as so:
$last_modified = stream_last_modified('http://www.php.net/news.rss');
if (!is_null($last_modified))
if ($last_modified < time()-3600) //Older than an hour
echo 'URL is older than an hour.';
else
echo 'URL is fairly new.';
else
echo 'Invalid URL!';
function stream_last_modified($url)
{
if (function_exists('version_compare') && version_compare(phpversion(), '4.3.0') > 0)
{
if (!($fp = @fopen($url, 'r')))
return NULL;
$meta = stream_get_meta_data($fp);
for ($j = 0; isset($meta['wrapper_data'][$j]); $j++)
{
if (strstr(strtolower($meta['wrapper_data'][$j]), 'last-modified'))
{
$modtime = substr($meta['wrapper_data'][$j], 15);
break;
}
}
fclose($fp);
}
else
{
$parts = parse_url($url);
$host = $parts['host'];
$path = $parts['path'];
if (!($fp = @fsockopen($host, 80)))
return NULL;
$req = "HEAD $path HTTP/1.0\r\nUser-Agent: PHP/".phpversion()."\r\nHost: $host:80\r\nAccept: */*\r\n\r\n";
fputs($fp, $req);
while (!feof($fp))
{
$str = fgets($fp, 4096);
if (strstr(strtolower($str), 'last-modified'))
{
$modtime = substr($str, 15);
break;
}
}
fclose($fp);
}
return isset($modtime) ? strtotime($modtime) : time();
}
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stream_get_line