PHP Types

Types are an essential part of any languae. Types means variable types that defines which type of data we are using. There are six PHP types. These are:

1. bolean
2. string
3. float
4. integer
5. array
6. object

Now I’ll eleborate them one by one.

Boolean: This is the very simple type. This type determine the truth values. In truth values, there may be  “false” or “true”. Note that both are case sensitive.

String: Php doesn’t support Unicode, it supports “256 character set”. String is a combination of characters and words, each chracter is a byte. String can be specifies in single quotes and double quotes.

Flaot: We also called floating numbers as doubles, real numbers and float. The sytax of floating numbers can be following as

<?php

$test = 3.4;

$test = 3.4e3;

$test = 7E-9;

?>

Integer: Integer can be any number but 3.4 like numbers are not allowed. It can range from (0 to 10) and (-10 to 0).

Array: Array is like a table. It have values and every value is associated to a unique key. For example:

<?php

$a = array(‘a’,’b’,’c’);

Or

$a[0] = a;

$a[1] = b;

$a[2] = c;

?>

We can also use multi-dimensional arrays. For Example

<?php

$a[0][0] = 3;

?>

Object: We often use objects in a class, these objects can also be calles as instances. For example.

<?php

Class test

{

                Function hello()

                {

                                echo “This is my first class”;

}             

}

$a = new test;

test->hello();

?>

Now variable $a is a object of the class test, that are accessing the class methods.