Is there a way on php to print or view all the environment variables and to determine if they are set or not.

[tommytx]

Not asking you to troubleshoot for me but to pop in any thoughts you might have on how YOU would troubleshoot this problem.. Thanks

This is a wp site.. and generated the following error..
 

Notice: Undefined index: USER_AGENT in /home/luxuryrealtygrp/public_html/wp-content/plugins/LRG/Masked/Filters.php on line 31

This is what line 31 that is being called out:
Line 31:
function lrg_masked_field($false, $field_name){
    if(is_user_logged_in() || stripos($_SERVER['USER_AGENT'], 'google') !== false || stripos($_SERVER['USER_AGENT'], 'yahoo') !== false || stripos($_SERVER['USER_AGENT'], 'bing') !== false){
        return false;
    }

Just looking for ideas that might help to chase this down..
My guess is that USER_AGENT since in all caps may be an environment variable.. Is there a way to display all environment variablles and if they are set or not.  Any ideas or thoughts would be appreciated.. Thanks!

 

 

Edited December 17, 2020 by tommytx

[requinix]

Capital letters does not make it an environment variable. It it were then you would probably be using $_ENV instead of $_SERVER.

https://www.php.net/manual/en/reserved.variables.server.php
HTTP headers stored in $_SERVER are prefixed by "HTTP_". Take a look on that page to see if maybe there's something useful.

To the question itself (since it is possible the User-Agent header may not be passed) then then solution is to check if the value is set before trying to use it.