Strpos problem.

[talbot_brian]

Hello,

 

I am trying to take a URL which is entered into the browser and then use strpos to redirect to specific pages based on the referrer.

 

The idea is that anyone typing "blue" or some derivative thereof into the browser is redirected to bluepage.html and all other visitors are redirected to otherpage.html

 

However, everyone is redirected to otherpage.html, including those who type "blue" into the browser.

 

Why?  Thanks!

 

<?php

 

$ref = $_SERVER['HTTP_REFERER'];      # have also tried HTTP_POST

 

if (strpos($ref, "blue"))

 

{

header('Location: bluepage.html');

exit;                                                      # have also tried without the 'exit;'

}

 

require('otherpage.html');

 

?>

[bh]

hi,

 

 

The address of the page (if any) which referred the user agent to the current page. This is set by the user agent. Not all user agents will set this, and some provide the ability to modify HTTP_REFERER as a feature. In short, it cannot really be trusted.

so becouse not all user agent set this value, you have to check whether this property is exists or not. try to debug it (eg output the referer)

[cyberRobot]

You might want to review the manual for strpos():

http://php.net/manual/en/function.strpos.php

 

 

The function may return results which will evaluate to false, such as 0 if "blue" is found at the beginning of the string. Maybe try something like:

 

<?php

$ref = $_SERVER['HTTP_REFERER'];      # have also tried HTTP_POST

if (strpos($ref, "blue") !== false) { 
     header('Location: bluepage.html'); 
     exit();                                                       # have also tried without the 'exit;'
}

require('otherpage.html');

?> 

 

 

Note that the code is untested.

[silkfire]

Even better, use stripos to allow for entering "bLuE" with mixed case.

[Pikachu2000]

HTTP_REFERER: The address of the page (if any) which referred the user agent to the current page . . .

 

Try using $_SERVER['REQUEST_URI'] and see if that gives you the result you're looking for.

 

if( stripos( $_SERVER['REQUEST_URI'], 'blue' ) !== FALSE ) {
     // etc.
}