PHP VARIABLE TYPES

PHP Variables are used to store data information in the middle of a PHP program.

What should we know about the Variables?

All the Variables are using in PHP programs are denoted with the dollar sign($).
The Value of a Variable is the value of its most recent assignment.
Variables are assigned with = operator, with variable on the left side and the expression to be evaluated on the right side.
Variables can be declared before assignment but do not needed.
Variables do not have intrinsic types which a variable does not know whether it will be used store number or a string of characters.
Variables used before they are assigned default values.
PHP does good job automatically can convert types from one another when it is necessary.
PHP variables are perl-like.

In PHP, there are total 8 datatypes as,

Integers- are the whole numbers without a decimal point like 4567

Doubles- are floating point numbers like 4.25

Booleans- Two possible values True or False

Null- It is a special type which has only one value, NULL.

Strings- are sequence of character like "Welome to PHP".

Arrays- are named and indexed the collection of other values.

Objects- are instance of programmers defined classes, which can be the package of other values and function specific to the class.

Resources- the special variable which holds reference of resources out of PHP like databases.

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