Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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>stream_filter_append</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN111202"
></A
><P
>    (PHP 4 &#62;= 4.3.0, PHP 5)</P
>stream_filter_append&nbsp;--&nbsp;Attach a filter to a stream.</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN111205"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>stream_filter_append</B
> ( resource stream, string filtername [, int read_write [, mixed params]])<BR
></BR
><P
>&#13;     Adds <VAR
CLASS="parameter"
>filtername</VAR
> to the list of filters 
     attached to <VAR
CLASS="parameter"
>stream</VAR
>.  This filter will be
     added with the specified <VAR
CLASS="parameter"
>params</VAR
>
     to the <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>end</I
></SPAN
> of the list and
     will therefore be called last during stream operations.  To
     add a filter to the beginning of the list, use 
     <A
HREF="function.stream-filter-prepend.html"
><B
CLASS="function"
>stream_filter_prepend()</B
></A
>.
    </P
><P
>&#13;     By default, <B
CLASS="function"
>stream_filter_append()</B
> will
     attach the filter to the <VAR
CLASS="literal"
>read filter chain</VAR
>
     if the file was opened for reading (i.e. File Mode:
     <VAR
CLASS="literal"
>r</VAR
>, and/or <VAR
CLASS="literal"
>+</VAR
>).  The filter
     will also be attached to the <VAR
CLASS="literal"
>write filter chain</VAR
>
     if the file was opened for writing (i.e. File Mode:
     <VAR
CLASS="literal"
>w</VAR
>, <VAR
CLASS="literal"
>a</VAR
>, and/or <VAR
CLASS="literal"
>+</VAR
>).
     <TT
CLASS="constant"
><B
>STREAM_FILTER_READ</B
></TT
>,
     <TT
CLASS="constant"
><B
>STREAM_FILTER_WRITE</B
></TT
>, and/or
     <TT
CLASS="constant"
><B
>STREAM_FILTER_ALL</B
></TT
> can also be passed to the
     <VAR
CLASS="parameter"
>read_write</VAR
> parameter to override this behavior.
    </P
><P
>&#13;     <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN111242"
></A
><P
><B
>Exemplu 1. Controlling where filters are applied</B
></P
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><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#FF8000">/* Open a test file for reading and writing */<br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"test.txt"</font><font color="#007700">, </font><font color="#DD0000">"rw"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Apply the ROT13 filter to the<br /> * write filter chain, but not the<br /> * read filter chain */<br /></font><font color="#0000BB">stream_filter_append</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"string.rot13"</font><font color="#007700">, </font><font color="#0000BB">STREAM_FILTER_WRITE</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Write a simple string to the file<br /> * it will be ROT13 transformed on the<br /> * way out */<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"This is a test\n"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Back up to the beginning of the file */<br /></font><font color="#0000BB">rewind</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Read the contents of the file back out.<br /> * Had the filter been applied to the<br /> * read filter chain as well, we would see<br /> * the text ROT13ed back to its original state */<br /></font><font color="#0000BB">fpassthru</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Expected Output<br />&nbsp;&nbsp;&nbsp;---------------<br /><br />Guvf vf n grfg<br /><br /> */<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>When using custom (user) filters: </B
>
      <A
HREF="function.stream-filter-register.html"
><B
CLASS="function"
>stream_filter_register()</B
></A
> must be called first
      in order to register the desired user filter to <VAR
CLASS="parameter"
>filtername</VAR
>.
     </P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      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 appended to a stream, data in the internal buffers is processed through
      the new filter at that time.  This differs from the behavior of
      <A
HREF="function.stream-filter-prepend.html"
><B
CLASS="function"
>stream_filter_prepend()</B
></A
>.
     </P
></BLOCKQUOTE
></DIV
><P
>&#13;     See also
     <A
HREF="function.stream-filter-register.html"
><B
CLASS="function"
>stream_filter_register()</B
></A
>, and
     <A
HREF="function.stream-filter-prepend.html"
><B
CLASS="function"
>stream_filter_prepend()</B
></A
>.
    </P
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