— As
with algebra, PHP variables can be used to hold values (x=5) or expressions
(z=x+y).
— A
variable can have a short name (like x and y) or a more descriptive name
(age, car_name, total, volume).
— Rules
for PHP variables:
— A
variable starts with the $ sign, followed by the name of the variable
— A
variable name must start with a letter or the underscore character
— A
variable name cannot start with a number
— A
variable name can only contain alpha-numeric characters and underscores (A-z,
0-9, and _ )
— Variable
names are case sensitive ($y and $Y are two different variables)
$name="john";
In the above example, $name is a Variable.
