PHP Data Types

PHP Tutorial » PHP Data Types

What are PHP data types?
In PHP language, unlike other programming languages (C ++, Java, etc.), we do not have to declare the data type, because the PHP language automatically determines the assigned value.

PHP supports the following eight data types.:

• Integer
• String
• Float
• Boolean
• Object
• Array
• NULL
• Resource

These data types are used to construct variables.

An integer data type is a non-decimal number, whole numbers, without a decimal point (...,-4, -3, -2, -1, 0, 1, 2, 3, 4, ...)

Integers can be specified in: decimal (base 10), hexadecimal (base 16), octal (base 8), or binary (base 2) notation

<?php

$x = 456; // decimal number

var_dump($x);

echo "<br>";



$y = -678; // a negative number

var_dump($y);

echo "<br>";



$z = 0xB1A; // hexadecimal number

var_dump($z);

echo "<br>";



$w = 2767; // octal number

var_dump($w);

?>   

A string is a sequence of characters, as "Hi, how are you".

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

<?php

$x = 'Hi, how are you';

echo $x;

echo "<br>";



$y = "Hi, how are you";

echo $y;

echo "<br>";



$z = 'Learn PHP tutorial, I\"ll be back soon.';

echo $z;

?> 

Related subjects:
PHP syntax What is an array PHP variables Echo and print statement

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A float (floating point number as "floats", "doubles", or "real numbers") is a number with a decimal point or fractional.

<?php

$x = 4.264;

var_dump($x);

echo "<br>";



$y = 12.23e3;

var_dump($y);

echo "<br>";



$z = 3E-10;

var_dump($z);

?>
      

To see the result of the PHP code above please click Execute

PHP Boolean

Booleans has only two possible values either 1 (true) or 0 (false).

<?php

// Assign the value TRUE to a variable

$show_error = true;

var_dump($show_error);

?>

An array can stores multiple values in one single variable.PHP var_dump() function returns the data type and value:

<?php

$my_colors = array("Red", "Blue", "Green");

var_dump($my_colors);

echo "<br>";



$color_codes = array(

"Red" => "#ff0000",

"Blue" => "#0000ff",

"Green" => "#00ff00"

);

var_dump($color_codes);

?>

PHP Objects

An object data type is a data that not only allows storing data but also information on, how to process that data.

An object is a specific instance of a class which serve as templates for objects. Objects are created based on this template via the new keyword.

<?php

// Class definition

class greeting{

// properties

public $my_greeting = "Hi, how are you!";



// methods

function show_greeting(){

return $this->my_greeting;

}

}



// Create object from class

$message = new greeting;

var_dump($message);

?>