how to define variable in php – Tutorialpath

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What is Variable in PHP

Variable are “containers” for storing information.

All variable in PHP start with a $ (dollar) sign followed by the name of the variable.

A valid variable name starts with a letters, numbers, or underscore (_), followed by any number of letters, number of letters, number, or underscores.

If a variable name is more than one word, it can be separated with underscore.

Syntax of declaring a variable in PHP is given below:

variable syntax

PHP has a total of eight data types which we use to construct our 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.
  • Resources − are special variables that hold references to resources external to PHP (such as database connections).

The first five are simple types, and the next two (arrays and objects) are compound – the compound types can package up other arbitrary values of arbitrary type, whereas the simple types cannot.

PHP Variable: Declaring string, integer and float

Let’s see the example to store string, integer and float values in PHP variables.


Variable Declaring string
Variable Declaring string


Variable Declaring string output

PHP Variable: Sum of two variables






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