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Remove duplicated security information. (Whoops.) git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@11547 c90b9560-bf6c-de11-be94-00142212c4b1
98 lines
2.8 KiB
Text
98 lines
2.8 KiB
Text
<chapter id="features.remote-files">
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<title>Using remote files</title>
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<para>
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As long as support for the "URL fopen wrapper" is enabled when
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you configure PHP (which it is unless you explicitly pass the
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<option>--disable-url-fopen-wrapper</option> flag to configure),
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you can use HTTP and FTP URLs with most functions that take a
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filename as a parameter, including the <function>require</function>
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and <function>include</function> statements.
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<note>
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<para>
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You can't use remote files in <function>include</function> and
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<function>require</function> statements on Windows.
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</note>
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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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<example>
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<title>Getting the title of a remote page</title>
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<programlisting>
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<?php
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$file = fopen("http://www.php.net/", "r");
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if (!$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 (eregi("<title>(.*)</title>", $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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</programlisting>
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</example>
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<para>
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You can also write to files on an FTP as long you connect as a user
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with the correct access rights, and the file doesn't exist already.
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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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'ftp://user:password@ftp.example.com/path/to/file'. (You can use the
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same sort of syntax to access files via HTTP when they require Basic
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authentication.)
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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>
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<?php
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$file = fopen("ftp://ftp.php.net/incoming/outputfile", "w");
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if (!$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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fputs($file, "$HTTP_USER_AGENT\n");
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fclose($file);
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?>
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</programlisting>
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</example>
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<note>
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<para>
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You might get the idea from the example above to use this technique to
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write to a remote log, but as mentioned above, you can only write to
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a new file using the URL fopen() wrappers. To do distributed logging
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like that, you should take a look at <function>syslog</function>.
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</note>
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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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sgml-parent-document:nil
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sgml-default-dtd-file:"../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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-->
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