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Last updated: Fri, 26 Jan 2007

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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

## Description

array 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();
}`
add a note
stream_get_transports stream_get_line

Last updated: Fri, 26 Jan 2007
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