mirror of
https://github.com/sigmasternchen/php-doc-en
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115 lines
3.4 KiB
XML
115 lines
3.4 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<chapter xml:id="features.remote-files" xmlns="http://docbook.org/ns/docbook">
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<title>Using remote files</title>
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<para>
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As long as <option>allow_url_fopen</option> is enabled in
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&php.ini;, you can use <acronym>HTTP</acronym> and <acronym>FTP</acronym>
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URLs with most of the functions
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that take a filename as a parameter. In addition, URLs can be
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used with the <function>include</function>,
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<function>include_once</function>, <function>require</function> and
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<function>require_once</function> statements
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(<option>allow_url_include</option> must be enabled for these).
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See <xref linkend="wrappers"/> for more information about the protocols
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supported by PHP.
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</para>
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<para>
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For example, you can use this to open a file on a remote web server,
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parse the output for the data you want, and then use that data in a
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database query, or simply to output it in a style matching the rest
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of your website.
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</para>
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<para>
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<example>
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<title>Getting the title of a remote page</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$file = fopen ("http://www.example.com/", "r");
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if (!$file) {
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echo "<p>Unable to open remote file.\n";
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exit;
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}
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while (!feof ($file)) {
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$line = fgets ($file, 1024);
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/* This only works if the title and its tags are on one line */
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if (preg_match ("@\<title\>(.*)\</title\>@i", $line, $out)) {
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$title = $out[1];
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break;
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}
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}
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fclose($file);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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You can also write to files on an FTP server (provided that you
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have connected as a user with the correct access rights). You
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can only create new files using this method; if you try to overwrite
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a file that already exists, the <function>fopen</function> call will
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fail.
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</para>
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<para>
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To connect as a user other than 'anonymous', you need to specify
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the username (and possibly password) within the URL, such as
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'<literal>ftp://user:password@ftp.example.com/path/to/file</literal>'.
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(You can use the same sort of syntax to access files via
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<acronym>HTTP</acronym> when they require Basic authentication.)
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</para>
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<para>
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<example>
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<title>Storing data on a remote server</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$file = fopen ("ftp://ftp.example.com/incoming/outputfile", "w");
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if (!$file) {
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echo "<p>Unable to open remote file for writing.\n";
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exit;
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}
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/* Write the data here. */
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fwrite ($file, $_SERVER['HTTP_USER_AGENT'] . "\n");
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fclose ($file);
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<note>
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<para>
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You might get the idea from the example above that you can use
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this technique to write to a remote log file. Unfortunately
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that would not work because the <function>fopen</function> call will
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fail if the remote file already exists. To do distributed logging
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like that, you should take a look at <function>syslog</function>.
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</para>
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</note>
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</para>
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</chapter>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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