Variables

Variables

Variables can store the following types of data:

string;

·	number (int/double);

·	true/false;

·	hash (associative array);

·	class of objects;

·	object of a class (user-defined class as well);

code;

·	expression.

To use a variable, you don't have to declare it in advance.

Different types of data demand different brackets to be used while a variable is assigned:

$variable_name[string]	assigns a string (an object of class string) or an object of some class;
$variable_name(expression)	assigns a number or result of some mathematical expression
$variable_name{code}	assigns some code to be executed when the variable is referred to

To retrieve value stored in a variable, you should refer to the variable by name:

$variable_name-retrieves value stored in variable

Examples

Code	Result
$string[2+2] $string	2+2
*$number(22) $number**	4
$i(0) $code{$i} $i(1) $code	1
$i(0) $string[$i] $i(1) $string	0

As a part of variable's name you may use:

...value stored in another variable:
$superman[value of superman variable]
$part[man]
$super$part
will return: value of superman variable

$name[picture]
${name}.gif
will return string picture.gif (but NOT field gif of object picture)

...result of some code:

$field.[b^eval(2+3)]
will return field b5 of object field.

Last updated: 04.09.2008