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PHP 5 Data Types

PHP Programming Sunday April 16th, 2017
445 Görüntülenme
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 
$x = "Hello world!";
$y = 'Hello world!';

echo $x;
echo "<br>"; 
echo $y;
?>
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 
$x = 5985;
var_dump($x);
?>
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 
$x = 10.365;
var_dump($x);
?>
 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:

<?php 
$cars = array("Volvo","BMW","Toyota");
var_dump($cars);
?>

You will learn a lot more about arrays in later chapters of this tutorial.

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