   #PHP Manual Stream functions stream_filter_append
   stream_filter_register

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                             stream_filter_prepend

   (PHP 4 >= 4.3.0)
   stream_filter_prepend -- Attach a filter to a stream.

Description

   bool stream_filter_prepend ( resource stream, string filtername [, int
   read_write [, mixed params]])

   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.

     When using custom (user) filters: stream_filter_register() must be
     called first in order to register the desired user filter to
     filtername.

   See also stream_filter_register(), and stream_filter_append()
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