Why is $b "b" in this logic when echoing out ${$b}

Posted by user275074 on Stack Overflow See other posts from Stack Overflow or by user275074
Published on 2010-03-27T09:02:03Z Indexed on 2010/03/27 9:23 UTC
Read the original article Hit count: 192

Filed under:

variable

|

variables

|

php

I'd have expected ${$b} to be 'a' but it is 'b', why is this the case?

$a = "b";
$b = "a";

Sorry again I forgot to put ${$b} produces "b"

© Stack Overflow or respective owner

Related posts about variable

PHP variable in variable

as seen on Stack Overflow - Search for 'Stack Overflow'
I have set an array in my config file that I use global in my functions. This works fine, but now I want to pass the name of this array as a @param in my function. // in config file: $album_type_arr = array("appartamento", "villa"); global $album_type_arr; // pull in from db_config echo $album_type_arr[0]; function… >>> More
JavaScript variable to ColdFusion variable

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a tricky one. By means of a <cfoutput query="…"> I list some records in the page from a SQL Server database. By the end of each line viewing I try to add this in to a record in a MySQL database. As you see is simple, because I can use the exact variables from the output query in to… >>> More
Swapping two variable value without using 3rd variable

as seen on Stack Overflow - Search for 'Stack Overflow'
One of the very tricky question asked in an interview... we need to swap the values of two variables like a=10 and b=15 Generaly to swap two variables values, we need 3rd variable like.. temp=a a=b b=temp Now the requirement is, swaping value of two variable values without using 3rd variable… >>> More
PHP - Variable inside variable?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hey guys... $bookA = "123"; $crack = "A"; I want to do something similar to this: echo $book$crack; Such that the output is 123. What is the correct syntax for the echo command? Thanks. >>> More
variable inside a variable in a php class

as seen on Stack Overflow - Search for 'Stack Overflow'
is it possible to copy a variable like this this? class Colours { var $var = "one"; var $var2 = array('something', $var); } >>> More

Related posts about variables

System Expandable-String Environment Variables Can’t Reference User Environment Variables

as seen on Super User - Search for 'Super User'
Hi, I’ve run into a bit of a situation with Windows environment variables. I’ve narrowed it down to what may or may not makes sense and/or possibly be by design. It seems that expandable-string environment variables of the local machine cannot reference environment variables of the current user. For… >>> More
Local variables and instance variables

as seen on Stack Overflow - Search for 'Stack Overflow'
Why is it that instance variables are initialised to default values while local variables aren't? >>> More
Arguments, local variables, and global variables coding convention in Python

as seen on Stack Overflow - Search for 'Stack Overflow'
In python, there is no way to differentiate between arguments, local variables, and global variables. The easy way to do so might be have some coding convention such as Global variables start with _ and capital letter arguments end with with _ _Gvariable = 10 def hello(x_, y_): z = x_ + y_ Is… >>> More
Arguments, local variables, and global variables in Python

as seen on Stack Overflow - Search for 'Stack Overflow'
In python, there is no way to differentiate between arguments, local variables, and global variables. The easy way to do so might be have some coding convention such as Global variables start with _ and capital letter arguments end with with _ _Global variable = 10 def hello(x_, y_): z =… >>> More
Difference between putting variables in header vs putting variables in source

as seen on Stack Overflow - Search for 'Stack Overflow'
Say I declare a header file with a variable: int count; Then in the source file, I want to use count. Do I have to declare it as: extern int count Or can I just use it in my source file? All assuming that I have #include "someheader.h". Or should I just declare it in the source file? What is… >>> More