### VARIABLE

VARIABLES

A variable is the name or the object that we assign strings,integers,floats etc to.Php variables always starts with the dollar sign($).Onlike other programming language,you do not need to define the data type.A valid php variable must start with the dollar sign and the name must not start with a number or any other special character apart from alphabets and the underscore sign(_).You can define php variables like this.

VALID:

$variablename="john";

$_variablename="john";

INVALID:

variablename="john";

_variablename="john";

8variablename="john";

$variablename="john";

$8variablename="john";

Variables can be of interger values,strings,floats etc.A string must be surrounded with the " " sign like in examples above but this doesnt apply to intergers.Also,all variables and statements must end (;) sign.

OPERATORS

Php also have operators to perform arithmetic and logical statements.*Operators*

+ -Addition

- -Subtration

* -Multiplication

/ -Division

% -Modulus

We all know what they are because we use them everyday of our lives.Note, the modulus operator is quite different.This operator divides two numbers and if there is a remainder,it returs it.Below are examples of this operators*Addition example*

x=2;

y=x+4;

ANS:6*Subtraction example*

x=2;

y=5;

z=y-x;

ANS:3*Multiplication example*

x=4;

x*5;

ANS:20*Division example*

x=10;

x=10/2;

ANS:5*Modulus (division remainder)*

x=4;

x%3

ANS:1*Increment example(++)*

x=5

x++

ANS x=6*Decrement example(++)*

x=5

x--

ANS:x=4

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