php-doc-en/reference/ftp/functions/ftp-nb-fget.xml

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<refentry xml:id="function.ftp-nb-fget" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>ftp_nb_fget</refname>
  <refpurpose>Retrieves a file from the FTP server and writes it to an open file (non-blocking)</refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>ftp_nb_fget</methodname>
   <methodparam><type>resource</type><parameter>ftp_stream</parameter></methodparam>
   <methodparam><type>resource</type><parameter>handle</parameter></methodparam>
   <methodparam><type>string</type><parameter>remote_file</parameter></methodparam>
   <methodparam><type>int</type><parameter>mode</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>resumepos</parameter><initializer>0</initializer></methodparam>
  </methodsynopsis>
  <para>
   <function>ftp_nb_fget</function> retrieves a remote file from the FTP 
   server.
  </para>
  <para>
   The difference between this function and <function>ftp_fget</function> is 
   that this function retrieves the file asynchronously, so your program can 
   perform other operations while the file is being downloaded.
  </para>
 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>ftp_stream</parameter></term>
     <listitem>
      <para>
       The link identifier of the FTP connection.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>handle</parameter></term>
     <listitem>
      <para>
       An open file pointer in which we store the data.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>remote_file</parameter></term>
     <listitem>
      <para>
       The remote file path.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>mode</parameter></term>
     <listitem>
      <para>
       The transfer mode. Must be either <constant>FTP_ASCII</constant> or
       <constant>FTP_BINARY</constant>.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>resumepos</parameter></term>
     <listitem>
      <para>The position in the remote file to start downloading from.</para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns <constant>FTP_FAILED</constant> or <constant>FTP_FINISHED</constant>
   or <constant>FTP_MOREDATA</constant>.
  </para>
 </refsect1>
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>ftp_nb_fget</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

// open some file for reading
$file = 'index.php';
$fp = fopen($file, 'w');

$conn_id = ftp_connect($ftp_server);

$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);

// Initate the download
$ret = ftp_nb_fget($conn_id, $fp, $file, FTP_BINARY);
while ($ret == FTP_MOREDATA) {

   // Do whatever you want
   echo ".";

   // Continue downloading...
   $ret = ftp_nb_continue($conn_id);
}
if ($ret != FTP_FINISHED) {
   echo "There was an error downloading the file...";
   exit(1);
}

// close filepointer
fclose($fp);
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>ftp_nb_get</function></member>
    <member><function>ftp_nb_continue</function></member>
    <member><function>ftp_fget</function></member>
    <member><function>ftp_get</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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