PHP Basic Part 4 and PHP Data Types

PHP Basic Part 4 and PHP Data Types



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Shaifullah Shaon (Black_EyE) was here.
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Welcome to PHP Basic- Part 4.

PHP Data Types

Variables can store data of different types, and different data types can do different things.

PHP supports the following data types:
String
Integer
Float (floating point numbers – also called double)
Boolean
Array
Object
NULL
Resource

PHP String
A string is a sequence of characters, like “Hello world!”.

A string can be any text inside quotes. You can use single or double quotes:

PHP Integer

An integer data type is a non-decimal number between -2,147,483,648 and 2,147,483,647.

Rules for integers:

An integer must have at least one digit
An integer must not have a decimal point
An integer can be either positive or negative
Integers can be specified in three formats: decimal (10-based), hexadecimal (16-based – prefixed with 0x) or octal (8-based – prefixed with 0)

In the following example $x is an integer. The PHP var_dump() function returns the data type and value:

PHP Float
A float (floating point number) is a number with a decimal point or a number in exponential form.

In the following example $x is a float. The PHP var_dump() function returns the data type and value:

PHP Boolean

A Boolean represents two possible states: TRUE or FALSE.
$x = true;
$y = false;
Booleans are often used in conditional testing. You will learn more about conditional testing in a later chapter of this tutorial.

PHP Array

An array stores multiple values in one single variable.

In the following example $cars is an array. The PHP var_dump() function returns the data type and value:
You will learn a lot more about arrays in later chapters of this tutorial.

PHP Object

An object is a data type which stores data and information on how to process that data.
In PHP, an object must be explicitly declared.
First we must declare a class of object. For this, we use the class keyword. A class is a structure that can contain properties and methods:
You will learn more about objects in a later chapter of this tutorial.

PHP NULL Value

Null is a special data type which can have only one value: NULL.
A variable of data type NULL is a variable that has no value assigned to it.
Tip: If a variable is created without a value, it is automatically assigned a value of NULL.
Variables can also be emptied by setting the value to NULL:

PHP Resource
The special resource type is not an actual data type. It is the storing of a reference to functions and resources external to PHP.
A common example of using the resource data type is a database call.
We will not talk about the resource type here, since it is an advanced topic.

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