function.preg-replace-callback.html

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     </dd>

    </dt>

    <dt>

     <span class="term"><i><tt class="parameter">count</tt></i>
</span>

     <dd>

      <p class="para">
       If specified, this variable will be filled with the number of
       replacements done.
      </p>
     </dd>

    </dt>

   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues">
  <h3 class="title">Return Values</h3>
  <p class="para">
   <b>preg_replace_callback()</b> returns an array if the
   <i><tt class="parameter">subject</tt></i>
 parameter is an array, or a string
   otherwise.
  </p>
  <p class="para">
   If matches are found, the new subject will be returned, otherwise
   <i><tt class="parameter">subject</tt></i>
 will be returned unchanged.
  </p>
 </div>


 <div class="refsect1 changelog">
  <h3 class="title">ChangeLog</h3>
  <p class="para">
   <table class="informaltable">
    <colgroup>

     <thead valign="middle">
      <tr valign="middle">
       <th colspan="1">Version</th>
       <th colspan="1">Description</th>
      </tr>

     </thead>

     <tbody valign="middle" class="tbody">
      <tr valign="middle">
       <td colspan="1" rowspan="1" align="left">5.1.0</td>
       <td colspan="1" rowspan="1" align="left">
        The <i><tt class="parameter">count</tt></i>
 parameter was added
       </td>
      </tr>

     </tbody>
    </colgroup>

   </table>
  </p>
 </div>


 <div class="refsect1 examples">
  <h3 class="title">Examples</h3>
  <p class="para">
   <div class="example">
    <p><b>Example #2 <b>preg_replace_callback()</b> example</b></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;this&nbsp;text&nbsp;was&nbsp;used&nbsp;in&nbsp;2002<br />//&nbsp;we&nbsp;want&nbsp;to&nbsp;get&nbsp;this&nbsp;up&nbsp;to&nbsp;date&nbsp;for&nbsp;2003<br /></span><span style="color: #0000BB">$text&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"April&nbsp;fools&nbsp;day&nbsp;is&nbsp;04/01/2002\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$text</span><span style="color: #007700">.=&nbsp;</span><span style="color: #DD0000">"Last&nbsp;christmas&nbsp;was&nbsp;12/24/2001\n"</span><span style="color: #007700">;<br /></span><span style="color: #FF8000">//&nbsp;the&nbsp;callback&nbsp;function<br /></span><span style="color: #007700">function&nbsp;</span><span style="color: #0000BB">next_year</span><span style="color: #007700">(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">)<br />{<br />&nbsp;&nbsp;</span><span style="color: #FF8000">//&nbsp;as&nbsp;usual:&nbsp;$matches[0]&nbsp;is&nbsp;the&nbsp;complete&nbsp;match<br />&nbsp;&nbsp;//&nbsp;$matches[1]&nbsp;the&nbsp;match&nbsp;for&nbsp;the&nbsp;first&nbsp;subpattern<br />&nbsp;&nbsp;//&nbsp;enclosed&nbsp;in&nbsp;'(...)'&nbsp;and&nbsp;so&nbsp;on<br />&nbsp;&nbsp;</span><span style="color: #007700">return&nbsp;</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">].(</span><span style="color: #0000BB">$matches</span><span style="color: #007700">[</span><span style="color: #0000BB">2</span><span style="color: #007700">]+</span><span style="color: #0000BB">1</span><span style="color: #007700">);<br />}<br />echo&nbsp;</span><span style="color: #0000BB">preg_replace_callback</span><span style="color: #007700">(<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"|(\d{2}/\d{2}/)(\d{4})|"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #DD0000">"next_year"</span><span style="color: #007700">,<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>The above example will output:</p></div>
    <div class="example-contents"><pre>
<div class="cdata"><pre>
April fools day is 04/01/2003
Last christmas was 12/24/2002
</pre></div>
    </pre></div>
   </div>
  </p>
  <p class="para">
   <div class="example">
    <p><b>Example #3 <b>preg_replace_callback()</b> using recursive structure
     to handle encapsulated BB code</b></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$input&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">"plain&nbsp;[indent]&nbsp;deep&nbsp;[indent]&nbsp;deeper&nbsp;[/indent]&nbsp;deep&nbsp;[/indent]&nbsp;plain"</span><span style="color: #007700">;<br /><br />function&nbsp;</span><span style="color: #0000BB">parseTagsRecursive</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">)<br />{<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$regex&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'#\[indent]((?:[^[]|\[(?!/?indent])|(?R))+)\[/indent]#'</span><span style="color: #007700">;<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;if&nbsp;(</span><span style="color: #0000BB">is_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$input&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'&lt;div&nbsp;style="margin-left:&nbsp;10px"&gt;'</span><span style="color: #007700">.</span><span style="color: #0000BB">$input</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">].</span><span style="color: #DD0000">'&lt;/div&gt;'</span><span style="color: #007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br /><br />&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;</span><span style="color: #0000BB">preg_replace_callback</span><span style="color: #007700">(</span><span style="color: #0000BB">$regex</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'parseTagsRecursive'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #0000BB">$output&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">parseTagsRecursive</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$output</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso">
  <h3 class="title">See Also</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><a href="function.preg-replace.html" class="function" rel="rdfs-seeAlso">preg_replace()</a></li>
    <li class="member"><a href="function.create-function.html" class="function" rel="rdfs-seeAlso">create_function()</a></li>
    <li class="member">information about the <a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> type</li>
   </ul>
  </p>
 </div>


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