When to use PHP's variable variables? [closed] - php

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I've been using PHP for some basics Back-End development for a while now. I saw something about interpretations of variables while I was looking for some changes which came with PHP 7. I'm not using them and it would be great if someone can explain why to use them?
What I mean is:
What are the pros of using them?

You use variable interpretation in situations when you need to dynamically reference a variable and don't want to use an array. Generally I would not recommend using it, as you lose benefits such as static code analysis.

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What's the difference between using PHP define constant and PHP $_GLOBALS? [closed]

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I read somewhere that defining constants with PHP's define function like so:
define('BASE_PATH','/var/www/html/example/');
is better and more secure than storing the same variable data inside a globals variable like so:
$_GLOBALS['BASE_PATH'] = '/var/www/html/example/';
Could somebody please explain the difference, which is better in which scenarios, and why?
I've just read here:
PHP Manual - The 'define' function
That the 'define' function can cause unwanted oddities.
a) What are the security implications of both?
b) How does PHP manage and store each of the variable's data in physical memory?

Passing a variable through href - is it a good approach? [closed]

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I'm currently working on my school project and I started wondering if it's a good approach to pass some variable through href so it can been seen in the URL.
Is it good or a bad way and why?
Or are there any better ways?
If it's not information that should be private I don't see why you couldn't do it. Especially if you need to reference something on a new page, it would make things easier.
It is good practice to use GET parameters for navigation purposes.
For user data input you can better use forms with POST.

Object Declaration on a array variable [closed]

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While Looking into a PHP Plugin i saw a line ,
$this->banks[0] = new Population();
It seems like they are declaring a object in a array variable. What is the use of it?
For what you described, it seems they're using a common pattern called Singleton that is useful in the way that you have all objects and their states accessible from only one common object.
It all depends on how the PHP plugin works.
The advantage of using a class instead of the array allows you to create function for a better data manipulation (e.g. a population class could have a function getPersonByName or getPersonsByAge which makes it easier instead of making a new loop each time.

Listing Functions In PHP [closed]

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How can i list the all functions i used in my site using php?I used a lot of php functions in my site.If there is any php function to check which functions are used in my site?
Check out doxygen. By running those scripts you will be able to list all functions and classes, and it links them so you can see the usage:
http://www.doxygen.nl/
You can look into running a phpxref on your codebase.
Example of function documentation output

What type of documentation does WordPress code follow? [closed]

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I am trying to begin using some sort of standard for documenting my PHP code. Most of my code is in the form of WordPress plugins, some are getting quite complex, and I need to document it.
So my question is simple, what system does WordPress use to document their code?
I think it uses phpDoc.
There is also a guide for WordPress inline documentation.

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