| Re: Seeking help with relative and absolute paths [message #180860 is a reply to message #180859] |
Fri, 22 March 2013 07:11   |
J.O. Aho
Messages: 194
Registered: September 2010
Karma:
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Senior Member |
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On 22/03/13 05:24, The Frog wrote:
> Thankyou very much for the replies. I appreciate the help. I have a follow-up question then regarding constants and setting them. If I define a constant say in the sites landing page (eg/index.php) will that constant then remain available for any scripts on pages that follow without having to 'require' them?
<?php
DEFINE('A', true);
include "fileB.php";
?>
In this case the A would exists in fileB.php, but it's a quite iffy way
to do it, as if you include fileB.php from another script which don't
have the define, then the A will be missing and you will end up with an
error. A constant will only exists after it has been defined and will
not remain in memory when you load a new page.
> The reason I ask is one of ignorance on my part. Having consulted the php manual on constants I am unable to make a clear determination on their usage and scope. It would seem in my experimentation and learning that a constant does not in fact remain but in fact needs to be re-defined in each unique page change on the users part. While this can be accommodated in the scripts and pages that I write I am wondering if there is a better way? Define once and use many places?
A constant will not magically live into another page, if you want a
value to be set on pageA and then be accessible on pageB and pageC then
use $_SESSION[]
see: http://www.php.net/manual/en/intro.session.php
--
//Aho
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