User Contributed Notes
URL Functions |
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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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13-Mar-2000 01:06 |
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To acccess the previous URL in history:
$HTTP_REFERER
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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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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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18-Aug-2000 11:20 |
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$HTTP_HOST still grabs the redirected server name.
ROCK N ROLL
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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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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 $js in your page script to generate
appropriate content when the remote user agent does not support
client-side scripts (such as most index/scan robots, some old or special
simplified browsers, or browsers with JavaScript disabled by their users).
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07-Feb-2002 12:29 |
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if you do this, it will be easier :
echo "
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21-Feb-2002 06:06 |
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$micadena = $HTTP_SERVER_VARS["HTTP_REFERER"];
Obtienes la p�gina anteriormente visitada
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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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sybase_select_db