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.

Example:

Variable Declaring string
Variable Declaring string

Output:

Variable Declaring string output

PHP Variable: Sum of two variables

Example:

 

Output:

 

Conclusion:

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