bash: defining a variable with or without export

What is export for? What is the difference between:

export name=value

Is there a better way of writing v = (v == 0 ? 1 : 0);

I want to toggle a variable between 0 and 1. If it's 0 I want to set it to 1, else if it's 1 I want to set it to 0.

How to cast variable to array

I have a variable $v that can be either single string or array of strings

How to scrape specific data from scrape with simple html dom parser

I am trying to scrape the datas from a webpage, but I get need to get all the data in this link .

How does PHP assign and free memory for variables?

I was wondering when does PHP free the memory which is used for a variables

What does immutable mean?

If a string is immutable, does that mean that.... (let's assume JavaScript)

var x, y = "foo"; Can this be accomplished?

Since it is possible to do:

var x = 'foo', y = 'foo';

Would this also be possible?

var x, y = 'foo';

I tried it, however x becomes undefined.

I know this may seem like a silly or redundant question, but if I'm curious about something, why not ask? Also you will probably wonder why I would need two variables equal to the same thing in scope . That is not the point of the question. I'm just curious.

Source: Tips4all

Is this a php variable variable bug?

Is there a logical explanation to this?

<?php  

$$a = 'hello world';  

echo $$a; //displays hello world  

echo $$aa; //displays hello world  

echo $$aaa; //displays hello world  

?>

jQuery dialog button variable

Can anyone tell me how can i use a varaible for button text in jQuery UI dialogs. I want to make a dynamic button name.

Why does Java allow control characters in its identifiers?

The Mystery

In exploring precisely which characters were permitted in Java identifiers, I have stumbled upon something so extremely curious that it seems nearly certain to be a bug.

Multiple variables access through foreach in php

foreach ($courses as $course, $sections as $section, $example as $example)

Is it preferred to assign POST variable to an actual variable?

I've just completed my registration form for my website and for the action page where all the SQL takes place I've just skipped assigning the POST variable to actual ones, like this...