Data Types

Data Types

Data types define what information is stored

The most used of them are:

Type	Description	Example
numeric	Whole or floating point number.	$var = 5; $var = 2.45;
string	Sequence of symbols (text).	$var = 'PHP is awesome!';
boolean	Can have only 2 values - true or false.	$var = true;

Printing Data

It's done using echo.

echo 'Message to print.';

Variables

The variables are used to store data of certain type.

Their value can be changed any time.

Example of variables definitions:

<?php // Declaring variable with value: $num1 = 5; // Declaring variable and setting value later: $num2; $num2 = -3; $num3 = 3.6; // String values are set in single or double quotes. $name1 = 'Alex'; $name2 = "Smith"; $letter = 'c'; $boolVariable1 = true; $boolVariable2 = false;

Basic program example:

Write a program in which variables are defined and printed.

Solution:

<?php $num = 5; $device = 'PC'; echo $num; echo ' '; echo $device;

Output:

5 PC