Solved

Understanding PHP code - absolute path

Posted on 2009-07-15
7
204 Views
Last Modified: 2013-12-13
I am working on a php web application. Trying to understand the path to files:
What does following code means?

img src="$$application_settings::base_path$$images/header.gif"

Why are there two dollar signs? (it's php 4.4.7)

0
Comment
Question by:awarraic
7 Comments
 
LVL 18

Expert Comment

by:Greg Alexander
ID: 24859409
I never use $$ but here is the explanation of it:

http://www.php.net/manual/en/language.variables.variable.php 
0
 
LVL 48

Accepted Solution

by:
hernst42 earned 250 total points
ID: 24859446
No this is template system. Somewhere you configure the value for application_settings::base_path and then in that file $$application_settings::base_path$$ is replaced by the template engine with the configured/calculated value. This has nothing to do with the $$ of php beasue you would get something like:

img src="foo::base_pathBAR/header.gif"

in your html
0
 

Author Comment

by:awarraic
ID: 24859478
How do I make that header display?
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 48

Assisted Solution

by:hernst42
hernst42 earned 250 total points
ID: 24859561
> Why are there two dollar signs? (it's php 4.4.7)
beacuse the programmer defined that variables for his template engine are stored between $$ and $$. Could also be ## and ##

> How do I make that header display?
Configure the template engine correctly.
0
 
LVL 19

Expert Comment

by:NerdsOfTech
ID: 24875584
*** $$ IS EXTREMELY DANGEROUS ***

Basically,

$$image will create a "PHP variable" with the name CONTAINED in the variable $image.

so if:
$image = 'pictures';
$$image would reference a variable named $pictures

Wha you want is to just change it to:
img src="http://www.yourwebsite/com/images/header.gif" // path to header.gif

Open in new window

0
 
LVL 19

Expert Comment

by:NerdsOfTech
ID: 24875587
Correction $$ will reference a variable based on the $variable

so if:
$image = 'pictures';
$image would reference a variable named $pictures
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Php pie charts 3 26
is this a cms? 8 33
Why my select dropdown does not work? 8 21
Scope of $_SESSION 17 25
Foreword (July, 2015) Since I first wrote this article, years ago, a great many more people have begun using the internet.  They are coming online from every part of the globe, learning, reading, shopping and spending money at an ever-increasing ra…
Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively.  This article explores the ways PHP can be used to hide and encrypt information.
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to count occurrences of each item in an array.

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now