PHP Variable

The main way to store information in the middle of a PHP program is by using a Variable.

                                        OR

Variables are the "Container" to store the value.

• Here are the most important things to know about variables in PHP.
• All variables in PHP are denoted with a leading dollar sign ($).
• The value of a variable is the value of its most recent assignment.
• Variables are assigned with the = operator, with the variable on the left-hand side and the expression to be evaluated on the right.
• Variables can, but do not need, to be declared before assignment.
• Variables in PHP do not have intrinsic types - a variable does not know in advance whether it will be used to store a number or a string of characters.
• Variables used before they are assigned have default values.
• PHP does a good job of automatically converting types from one to another when necessary.
• PHP variables are Perl-like.

Types of Variables :

Integers	are whole numbers, without a decimal point, like 4195.
Doubles	are floating-point numbers, like 3.14159 or 49.1.
Booleans	have only two possible values either true or false.
NULL	is a special type that only has one value: NULL.
Strings	are sequences of characters, like 'PHP supports string operations.'
Arrays	are named and indexed collections of other values.
Objects	are instances of programmer-defined classes, which can package up both other kinds of values and functions that are specific to the class.