PHP Manual: stream_get_meta

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.
Note: 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 Appendix M for more information about wrappers.
wrapper_data (mixed) - wrapper specific data attached to this stream. See Appendix 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.

Note: 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.

Note: 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.