php-doc-en/reference/pcre/functions/preg-replace-callback.xml

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  <refentry id="function.preg-replace-callback">
   <refnamediv>
    <refname>preg_replace_callback</refname>
    <refpurpose>Perform a regular expression search and replace using a callback</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>mixed</type><methodname>preg_replace_callback</methodname>
      <methodparam><type>mixed</type><parameter>pattern</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>callback</parameter></methodparam>
      <methodparam><type>mixed</type><parameter>subject</parameter></methodparam>
      <methodparam choice="opt"><type>int</type><parameter>limit</parameter></methodparam>
     </methodsynopsis>
    <para>
     The behavior of this function is almost identical to
     <function>preg_replace</function>, except for the fact that instead of
     <parameter>replacement</parameter> parameter, one should specify a
     <parameter>callback</parameter> that will be called and passed an array of
     matched elements in the subject string. The callback should return the
     replacement string. This function was added in PHP 4.0.5.
    </para>
    <para>
     See also <function>preg_replace</function>.
    </para>
   </refsect1>
  </refentry>

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