stream-bucket-prepend.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
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<refentry xml:id="function.stream-bucket-prepend" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>stream_bucket_prepend</refname>
  <refpurpose>
   Prepend bucket to brigade
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>void</type><methodname>stream_bucket_prepend</methodname>
   <methodparam><type>resource</type><parameter>brigade</parameter></methodparam>
   <methodparam><type>StreamBucket</type><parameter>bucket</parameter></methodparam>
  </methodsynopsis>
  <para>
    This function can be called to prepend a bucket to a bucket brigade. It
    is typically called from <methodname>php_user_filter::filter</methodname>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>brigade</parameter></term>
    <listitem>
     <para>
      <parameter>brigade</parameter> is a resource pointing to a <literal>bucket brigade</literal>
      which contains one or more <literal>bucket</literal> objects.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>bucket</parameter></term>
    <listitem>
     <para>
      A bucket object.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     <row>
      <entry>8.4.0</entry>
      <entry>&stream.bucket.param;</entry>
     </row>
    </tbody>
   </tgroup>
  </informaltable>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>stream_bucket_prepend</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php

class foo extends php_user_filter {
  protected $calls = 0;
  public function filter($in, $out, &$consumed, $closing) {
    while ($bucket = stream_bucket_make_writeable($in)) {
      $consumed += $bucket->datalen;
      if ($this->calls++ == 2) {
        // This bucket will appear again before any other bucket.
        stream_bucket_prepend($in, $bucket);
      }
    }
    return PSFS_FEED_ME;
  }
}
stream_filter_register('test', 'foo');
print  file_get_contents('php://filter/read=test/resource=foo');
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
</refentry>
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