User Contributed Notes
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[email protected]
17-Feb-2000 09:30 |
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Use $REQUEST_URI to get the most important part of the URL of the current
page
(see predefined variables for more info)
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[email protected]
13-Mar-2000 01:06 |
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To acccess the previous URL in history:
$HTTP_REFERER
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[email protected]
01-Apr-2000 05:18 |
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To check if a URL is valid, try to fopen() it. If fopen() results an error
(returns false), then PHP cannot open the URL you asked. This is usually
because it is not valid...
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[email protected]
18-Aug-2000 06:56 |
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To get the full url of what should be currently
in a users browser, try
this:
$url = sprintf("%s%s%s",");
echo
"$url";
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[email protected]
18-Aug-2000 11:20 |
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$HTTP_HOST still grabs the redirected server name.
ROCK N ROLL
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[email protected]
26-May-2001 03:55 |
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Warning: when the PHP engine runs for your hosted web site, it may execute
on a domain name which is completely different than the one the user
requested in its browser. Many free web hosting site use proxies and/or
multiple DNS entries for your hosted web site. This means that:
- the
IP of the web server can change if multiple DNS entries are present (there
may be several web servers running concurrently)
- reverse DNS name
from the IP may give different domain name over time, or if the domain
name is a CNAME only for a virtual web server hosting many domains
-
the server running PHP may be different than the web server
- the web
server may be hidden behind a proxy which balances the load between a farm
of servers
- the queried host name in the HTTP headers may be
different than the queried host name in the browser, if behind a
redirecting proxy
- the actual path name of the ressource may be also
different, with additional path elements: this is very common on free
hosting servers, where you get a virtual CNAME domain, which gets
translated by a proxy into an actual web server, and a domain-specific
document root directory
So when thinking about using absolute
path names you can retreive from PHP, beware that this may not be accurate
to insert as absolute URL's in the HTML code built with PHP.
The
best solution is then to ALWAYS USE relative URLs to reference documents
and form scripts on your local server !
This applies to $PHP_SELF
too, because it's an absolute pathname: don't use it directly but you can
safely use basename($PHP_SELF) to reference your script within HTML
forms:
<?
$self=basename($PHP_SELF);
?>
<HTML><HEAD>
...
</HEAD><BODY>
<FORM
method="GET"
action="$self">
...
</FORM>
</BODY></HTML>
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[email protected]
26-May-2001 04:47 |
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Note also that the URL shown in $HTTP_REFERER is not always the URL of the
web page where the user clicked to invoke the PHP script.
This may
instead be a document of your own web site, which contains an HTML element
whose one attribute references the script. Note also that the current page
fragment (#anchor) may be transmitted or not with the URL, depending on
the browser.
Examples:
<FRAME
src="your-page-script.php"8>
<IMAGE
src="your-image-script.php">
In such case, browsers
should transmit the URL of the container document, but some still persist
in using the previous document in the browser history, and this could
cause a different $HTTP_REFERER value be sent when the user comes back to
the document referencing your script. If you wanna be sure that the actual
current document or previous document in the history is sent, use
client-side JavaScript to send it to your script:
<SCRIPT
language="JavaScript"><!--
document.writeln('<FRAME
src="your-page-script.php?js=1&ref=' +
document.location
+ '">');
--></SCRIPT><NOSCRIPT>
<FRAME
src="your-page-script.php?js=0">
</NOSCRIPT>
And
then check the value of $js in your page script to generate appropriate
content when the remote user agent does not support client-side scripts
(such as most index/scan robots, some old or special simplified browsers,
or browsers with JavaScript disabled by their users).
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[email protected]
21-Feb-2002 06:06 |
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$micadena = $HTTP_SERVER_VARS["HTTP_REFERER"];
Obtienes la
p�gina anteriormente visitada
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[email protected]
29-Apr-2002 03:15 |
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If you want to get the filename requested on a global error page like a
404, just use this code...
// get the full var...
$page =
$HTTP_SERVER_VARS["QUERY_STRING"];
// part[1] is the
url...
// part[0] is the http code (404,
etc).
if(strpos($page,";")>0) {
$pageParts =
explode(";",$page);
$page = $pageParts[1];
}
//
get only the filename...
$page = basename($page);
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aflorio 'at' ecp.inf.puc-rio.br
03-Jul-2002 04:36 |
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If you want to check if a variable was passed in the querystring (ie.,
<url>?var=value&...), but don't want to use 'isset($var)'
because maybe the var is in the session (and so you can get
wrong
'true's), use the $_GET array.
For
example:
isset($_GET['var']) == TRUE if var in querystring,
but
isset($_GET['var']) == FALSE if var in session and not in
querystring
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[email protected]
10-Jul-2002 08:14 |
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Note that $_SERVER["HTTP_REFERER"] may not include GET data that
was included in the referring address, depending on the browser. So if
you rely on GET variables to generate a page, it's not a good idea to use
HTTP_REFERER to smoothly "bounce" someone back to the page
he/she came from.
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