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(PHP 4 >= 4.3.0, PHP 5)
stream_get_meta_data — Retrieves header/meta data from streams/file pointers
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.
Hinweis: You shouldn't use this value in a script.
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 Supported Protocols and Wrappers for more information about wrappers.
wrapper_data (mixed) - wrapper specific data attached to this stream. See Supported Protocols and Wrappers 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.
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.
| Version | Beschreibung |
|---|---|
| 5.0.0 | The following entries were added in the returned array: mode, seekable, and uri. |
| 4.3.0 | The following entries were added in the returned array: stream_type, wrapper_type, wrapper_data, and filters. |
| 4.3.0 | socket_get_status() is an alias for this function. Prior to PHP 4.3.0, it was used to retrieve the first four items, for socket based streams only. |
Beispiel #1 stream_get_meta_data() example
<?php
$url = 'http://www.example.com/';
if (!$fp = fopen($url, 'r')) {
trigger_error("Unable to open URL ($url)", E_USER_ERROR);
}
$meta = stream_get_meta_data($fp);
print_r($meta);
fclose($fp);
?>
Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:
Array
(
[wrapper_data] => Array
(
[0] => HTTP/1.1 200 OK
[1] => Server: Apache/2.2.3 (Red Hat)
[2] => Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT
[3] => ETag: "b300b4-1b6-4059a80bfd280"
[4] => Accept-Ranges: bytes
[5] => Content-Type: text/html; charset=UTF-8
[6] => Set-Cookie: FOO=BAR; expires=Fri, 21-Dec-2012 12:00:00 GMT; path=/; domain=.example.com
[6] => Connection: close
[7] => Date: Fri, 16 Oct 2009 12:00:00 GMT
[8] => Age: 1164
[9] => Content-Length: 438
)
[wrapper_type] => http
[stream_type] => tcp_socket/ssl
[mode] => r
[unread_bytes] => 438
[seekable] =>
[uri] => http://www.example.com/
[timed_out] =>
[blocked] => 1
[eof] =>
)
Hinweis:
This function does NOT work on sockets created by the Socket extension.
here is just an example how to read out all meta data.
how ever I found out that the "seekable"-entry doesn't exist in most of the streaming media files.
if (!($fp = @fopen($url, 'r')))
return NULL;
$meta = stream_get_meta_data($fp);
foreach(array_keys($meta) as $h){
$v = $meta[$h];
echo "".$h.": ".$v."<br/>";
if(is_array($v)){
foreach(array_keys($v) as $hh){
$vv = $v[$hh];
echo "_".$hh.": ".$vv."<br/>";
}
}
}
fclose($fp);
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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