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As long as support for the "URL fopen wrapper" is enabled when
you configure PHP (which it is unless you explicitly pass the
--disable-url-fopen-wrapper flag to configure),
you can use HTTP and FTP URLs with most functions that take a
filename as a parameter, including the require()
and include() statements.
Note:
You can't use remote files in include() and
require() statements on Windows.
For example, you can use this to open a file on a remote web server,
parse the output for the data you want, and then use that data in a
database query, or simply to output it in a style matching the rest
of your website.
Example 20-1. Getting the title of a remote page
<?php
$file = fopen ("http://www.php.net/", "r");
if (!$file) {
echo "<p>Unable to open remote file.\n";
exit;
}
while (!feof ($file)) {
$line = fgets ($file, 1024);
/* This only works if the title and its tags are on one line */
if (eregi ("<title>(.*)</title>", $line, $out)) {
$title = $out[1];
break;
}
}
fclose($file);
?>
You can also write to files on an FTP as long you connect as a user
with the correct access rights, and the file doesn't exist already.
To connect as a user other than 'anonymous', you need to specify
the username (and possibly password) within the URL, such as
'ftp://user:password@ftp.example.com/path/to/file'. (You can use the
same sort of syntax to access files via HTTP when they require Basic
authentication.)
Example 20-2. Storing data on a remote server
<?php
$file = fopen ("ftp://ftp.php.net/incoming/outputfile", "w");
if (!$file) {
echo "<p>Unable to open remote file for writing.\n";
exit;
}
/* Write the data here. */
fputs ($file, "$HTTP_USER_AGENT\n");
fclose ($file);
?>
Note:
You might get the idea from the example above to use this
technique to write to a remote log, but as mentioned above, you
can only write to a new file using the URL fopen() wrappers. To
do distributed logging like that, you should take a look at
syslog().
