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><H1
><A
NAME="function.stream-filter-register"
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>stream_filter_register</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN223017"
></A
><P
>    (PHP 5)</P
>stream_filter_register&nbsp;--&nbsp;
     Register a stream filter implemented as a PHP class 
     derived from <TT
CLASS="literal"
>php_user_filter</TT
>
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN223021"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>stream_filter_register</B
> ( string filtername, string classname )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>stream_filter_register()</B
> allows you to implement
     your own filter on any registered stream used with all the other
     filesystem functions (such as <A
HREF="function.fopen.html"
><B
CLASS="function"
>fopen()</B
></A
>,
     <A
HREF="function.fread.html"
><B
CLASS="function"
>fread()</B
></A
> etc.).
    </P
><P
>&#13;     To implement a filter, you need to define a class as an extension of
     <TT
CLASS="literal"
>php_user_filter</TT
> with a number of member functions 
     as defined below. When performing read/write operations on the stream
     to which your filter is attached, PHP will pass the data through your
     filter (and any other filters attached to that stream) so that the
     data may be modified as desired. You must implement the methods
     exactly as described below - doing otherwise will lead to undefined
     behaviour.
    </P
><P
>&#13;     <B
CLASS="function"
>stream_filter_register()</B
> will return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> if the
     <CODE
CLASS="parameter"
>filtername</CODE
> is already defined.
    </P
>int <B
CLASS="methodname"
>filter</B
> ( resource in, resource out, int &#38;consumed, bool closing )<BR
></BR
><P
>&#13;     This method is called whenever data is read from or written to 
     the attached stream (such as with <A
HREF="function.fread.html"
><B
CLASS="function"
>fread()</B
></A
> or <A
HREF="function.fwrite.html"
><B
CLASS="function"
>fwrite()</B
></A
>).  
     <CODE
CLASS="parameter"
>in</CODE
> is a resource pointing to a <TT
CLASS="literal"
>bucket brigade</TT
>
     which contains one or more <TT
CLASS="literal"
>bucket</TT
> objects containing data to be filtered.
     <CODE
CLASS="parameter"
>out</CODE
> is a resource pointing to a second <TT
CLASS="literal"
>bucket brigade</TT
>
     into which your modified buckets should be placed.
     <CODE
CLASS="parameter"
>consumed</CODE
>, which must <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>always</I
></SPAN
>
     be declared by reference, should be incremented by the length of the data
     which your filter reads in and alters.  In most cases this means you will
     increment <CODE
CLASS="parameter"
>consumed</CODE
> by $bucket-&#62;datalen for each $bucket.
     If the stream is in the process of closing (and therefore this is the last pass
     through the filterchain), the <CODE
CLASS="parameter"
>closing</CODE
> parameter will be
     set to <TT
CLASS="constant"
><B
>TRUE</B
></TT
>  The <CODE
CLASS="methodname"
>filter</CODE
> method must return one of
     three values upon completion.  

     <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN223071"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Return Value</TH
><TH
>Meaning</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>PSFS_PASS_ON</B
></TT
></TD
><TD
>&#13;          Filter processed successfully with data available in the 
          <CODE
CLASS="parameter"
>out</CODE
> <TT
CLASS="literal"
>bucket brigade</TT
>.
         </TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>PSFS_FEED_ME</B
></TT
></TD
><TD
>&#13;          Filter processed successfully, however no data was available to
          return.  More data is required from the stream or prior filter.
         </TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>PSFS_ERR_FATAL</B
></TT
> (default)</TD
><TD
>&#13;          The filter experienced an unrecoverable error and cannot continue.  
         </TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
    </P
>bool <B
CLASS="methodname"
>onCreate</B
> ( void  )<BR
></BR
><P
>&#13;     This method is called during instantiation of the filter class
     object.  If your filter allocates or initializes any other resources
     (such as a buffer), this is the place to do it.  Your implementation of
     this method should return <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure, or <TT
CLASS="constant"
><B
>TRUE</B
></TT
> on success.
    </P
><P
>&#13;     When your filter is first instantiated, and 
     <TT
CLASS="literal"
>yourfilter-&#62;onCreate()</TT
> is called, a number of properties
     will be available as shown in the table below.
    </P
><P
>&#13;     <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN223102"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Property</TH
><TH
>Contents</TH
></TR
></THEAD
><TBODY
><TR
><TD
><TT
CLASS="literal"
>FilterClass-&#62;filtername</TT
></TD
><TD
>A string containing the name the filter was instantiated with.
                Filters may be registered under multiple names or under wildcards.
                Use this property to determine which name was used.</TD
></TR
><TR
><TD
><TT
CLASS="literal"
>FilterClass-&#62;params</TT
></TD
><TD
>The contents of the <CODE
CLASS="parameter"
>params</CODE
> parameter passed
                to <A
HREF="function.stream-filter-append.html"
><B
CLASS="function"
>stream_filter_append()</B
></A
> 
                or <A
HREF="function.stream-filter-prepend.html"
><B
CLASS="function"
>stream_filter_prepend()</B
></A
>.</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
    </P
>void <B
CLASS="methodname"
>onClose</B
> ( void  )<BR
></BR
><P
>&#13;     This method is called upon filter shutdown (typically, this is also
     during stream shutdown), and is executed <SPAN
CLASS="emphasis"
><I
CLASS="emphasis"
>after</I
></SPAN
>
     the <TT
CLASS="literal"
>flush</TT
> method is called.  If any resources
     were allocated or initialzed during <TT
CLASS="literal"
>onCreate</TT
>
     this would be the time to destroy or dispose of them.
    </P
><P
>&#13;     The example below implements a filter named <TT
CLASS="literal"
>strtoupper</TT
>
     on the <TT
CLASS="literal"
>foo-bar.txt</TT
> stream which will capitalize
     all letter characters written to/read from that stream.

     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN223131"
></A
><P
><B
>例 1. Filter for capitalizing characters on foo-bar.txt stream</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">/* Define our filter class */<br /></font><font color="#007700">class </font><font color="#0000BB">strtoupper_filter </font><font color="#007700">extends </font><font color="#0000BB">php_user_filter </font><font color="#007700">{<br />&nbsp;&nbsp;function </font><font color="#0000BB">filter</font><font color="#007700">(</font><font color="#0000BB">$in</font><font color="#007700">, </font><font color="#0000BB">$out</font><font color="#007700">, &amp;</font><font color="#0000BB">$consumed</font><font color="#007700">, </font><font color="#0000BB">$closing</font><font color="#007700">) <br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;while (</font><font color="#0000BB">$bucket </font><font color="#007700">= </font><font color="#0000BB">stream_bucket_make_writeable</font><font color="#007700">(</font><font color="#0000BB">$in</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data </font><font color="#007700">= </font><font color="#0000BB">strtoupper</font><font color="#007700">(</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$consumed </font><font color="#007700">+= </font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">datalen</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">stream_bucket_append</font><font color="#007700">(</font><font color="#0000BB">$out</font><font color="#007700">, </font><font color="#0000BB">$bucket</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">PSFS_PASS_ON</font><font color="#007700">;<br />&nbsp;&nbsp;}<br />} <br /><br /></font><font color="#FF8000">/* Register our filter with PHP */<br /></font><font color="#0000BB">stream_filter_register</font><font color="#007700">(</font><font color="#DD0000">"strtoupper"</font><font color="#007700">, </font><font color="#DD0000">"strtoupper_filter"</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or die(</font><font color="#DD0000">"Failed to register filter"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"foo-bar.txt"</font><font color="#007700">, </font><font color="#DD0000">"w"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Attach the registered filter to the stream just opened */<br /></font><font color="#0000BB">stream_filter_append</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"strtoupper"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Line1\n"</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Word - 2\n"</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Easy As 123\n"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">fclose</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Read the contents back out<br /> */<br /></font><font color="#0000BB">readfile</font><font color="#007700">(</font><font color="#DD0000">"foo-bar.txt"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>LINE1
WORD - 2
EASY AS 123</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN223137"
></A
><P
><B
>例 2. Registering a generic filter class to match multiple filter names.</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br /></font><font color="#FF8000">/* Define our filter class */<br /></font><font color="#007700">class </font><font color="#0000BB">string_filter </font><font color="#007700">extends </font><font color="#0000BB">php_user_filter </font><font color="#007700">{<br />&nbsp;&nbsp;var </font><font color="#0000BB">$mode</font><font color="#007700">;<br /><br />&nbsp;&nbsp;function </font><font color="#0000BB">filter</font><font color="#007700">(</font><font color="#0000BB">$in</font><font color="#007700">, </font><font color="#0000BB">$out</font><font color="#007700">, &amp;</font><font color="#0000BB">$consumed</font><font color="#007700">, </font><font color="#0000BB">$closing</font><font color="#007700">) <br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;while (</font><font color="#0000BB">$bucket </font><font color="#007700">= </font><font color="#0000BB">stream_bucket_make_writeable</font><font color="#007700">(</font><font color="#0000BB">$in</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">mode </font><font color="#007700">== </font><font color="#0000BB">1</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data </font><font color="#007700">= </font><font color="#0000BB">strtoupper</font><font color="#007700">(</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} elseif (</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">mode </font><font color="#007700">== </font><font color="#0000BB">0</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data </font><font color="#007700">= </font><font color="#0000BB">strtolower</font><font color="#007700">(</font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">data</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$consumed </font><font color="#007700">+= </font><font color="#0000BB">$bucket</font><font color="#007700">-&gt;</font><font color="#0000BB">datalen</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">stream_bucket_append</font><font color="#007700">(</font><font color="#0000BB">$out</font><font color="#007700">, </font><font color="#0000BB">$bucket</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">PSFS_PASS_ON</font><font color="#007700">;<br />&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;function </font><font color="#0000BB">onCreate</font><font color="#007700">() <br />&nbsp;&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;if (</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">filtername </font><font color="#007700">== </font><font color="#DD0000">'str.toupper'</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">mode </font><font color="#007700">= </font><font color="#0000BB">1</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;} elseif (</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">filtername </font><font color="#007700">== </font><font color="#DD0000">'str.tolower'</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$this</font><font color="#007700">-&gt;</font><font color="#0000BB">mode </font><font color="#007700">= </font><font color="#0000BB">0</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">/* Some other str.* filter was asked for,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;report failure so that PHP will keep looking */<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#007700">return </font><font color="#0000BB">false</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;return </font><font color="#0000BB">true</font><font color="#007700">;<br />&nbsp;&nbsp;}<br />} <br /><br /></font><font color="#FF8000">/* Register our filter with PHP */<br /></font><font color="#0000BB">stream_filter_register</font><font color="#007700">(</font><font color="#DD0000">"str.*"</font><font color="#007700">, </font><font color="#DD0000">"string_filter"</font><font color="#007700">)<br />&nbsp;&nbsp;&nbsp;&nbsp;or die(</font><font color="#DD0000">"Failed to register filter"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">$fp </font><font color="#007700">= </font><font color="#0000BB">fopen</font><font color="#007700">(</font><font color="#DD0000">"foo-bar.txt"</font><font color="#007700">, </font><font color="#DD0000">"w"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">/* Attach the registered filter to the stream just opened <br />&nbsp;&nbsp;&nbsp;We could alternately bind to str.tolower here */<br /></font><font color="#0000BB">stream_filter_append</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"str.toupper"</font><font color="#007700">);<br /><br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Line1\n"</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Word - 2\n"</font><font color="#007700">);<br /></font><font color="#0000BB">fwrite</font><font color="#007700">(</font><font color="#0000BB">$fp</font><font color="#007700">, </font><font color="#DD0000">"Easy As 123\n"</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">/* Read the contents back out<br /> */<br /></font><font color="#0000BB">readfile</font><font color="#007700">(</font><font color="#DD0000">"foo-bar.txt"</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
></TR
></TABLE
><P
>上例将输出：</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><PRE
CLASS="screen"
>LINE1
WORD - 2
EASY AS 123</PRE
></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
    </P
><P
>&#13;     See also
     <A
HREF="function.stream-wrapper-register.html"
><B
CLASS="function"
>stream_wrapper_register()</B
></A
>,
     <A
HREF="function.stream-filter-prepend.html"
><B
CLASS="function"
>stream_filter_prepend()</B
></A
>, and
     <A
HREF="function.stream-filter-append.html"
><B
CLASS="function"
>stream_filter_append()</B
></A
>.
    </P
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