Adds filtername to the list of filters
attached to stream. This filter will be
added with the specified params
to the beginning of the list and
will therefore be called first during stream operations. To
add a filter to the end of the list, use
stream_filter_append().
By default, stream_filter_prepend() will
attach the filter to the read filter chain
if the file was opened for reading (i.e. File Mode:
r, and/or +). The filter
will also be attached to the write filter chain
if the file was opened for writing (i.e. File Mode:
w, a, and/or +).
STREAM_FILTER_READ,
STREAM_FILTER_WRITE, and/or
STREAM_FILTER_ALL can also be passed to the
read_write parameter to override this behavior.
See stream_filter_append() for an example of
using this parameter.
As of PHP 5.1.0, this function returns a resource which can be used to refer to this filter instance during a call to stream_filter_remove(). Prior to PHP 5.1.0, this function returns TRUE on success or FALSE on failure.
When using custom (user) filters: stream_filter_register() must be called first in order to register the desired user filter to
filtername.
Note: Stream data is read from resources (both local and remote) in chunks, with any unconsumed data kept in internal buffers. When a new filter is prepended to a stream, data in the internal buffers, which has already been processed through other filters will not be reprocessed through the new filter at that time. This differs from the behavior of stream_filter_append().
See also stream_filter_register(), and stream_filter_append().