PHP Data Type

PHP Data Type

PHP scripting language supports 13 primitive data types. Data Types playimportant role in all programing languages to classify the data according to the logics. PHP supports the following data types.

1. String

2. Integer

3. Float

4. Boolean

5. Array

6. Object

7. NULL

8. Resource

String:

String is a collection of characters within the double or single quotes like

“Computer Application” or ‘Computer Application’. Space is also considered as a character.

Example:

<?php

$x = “Computer Application!”;

$y = ‘Computer Application’;

echo $x;

echo “<br>”;

echo $y;

?>

Integer:

Integer is a data type which contains non decimal numbers.

Example:

<?php

$x = 59135;

var_dump($x);

?>

Float:

Float is a data type which contains decimal numbers.

Example:

<?php

$x = 19.15;

var_dump($x);

?>

Boolean:

Boolean is a data type which denotes the possible two states, TRUE or FALSE

Example:

<?php

$x = true;

$y = false;

echo $x;

echo $y;

?>

Array:

Array is a data type which has multiple values in single variable. You will learn about arrays in the next chapter.

Example:

<?php

$cars = array(“Computer”,”Laptop”,”Mobile”);

var_dump($cars);

?>

OUTPUT:

array(3) { [0]=> string(5) “Computer “ [1]=> string(3) “Laptop “ [2]=> string(6) “Mobile “ }

Var_dump:

The var_dump() system define function, returns structured information (type and value) about variables in PHP.

Object:

In PHP object is a data type which contains information about data and function inside the class.

<?php

class School {

function marks() {

$this->sec = “A”;

}

}

// create an object

$school_obj = new School ();

//show object properties

echo $school_obj ->sec;

?>

NULL:

Null is a special data type which contains no value:

<?php

$x = “COMPUTER APPLICATION!”;

$x = null;

var_dump($x);

?>

OUTPUT:

NULL

Resources

Resource is a specific variable, it has a reference to an external resource. These variables hold specific handlers to handle files and database connections in respective PHP program.

<?php

// Open a file for reading

$handle = fopen(“note.txt”, “r”);

var_dump($handle);

echo “<br>”;

//Connect to MySQL database server with default setting

$link = mysql_connect(“localhost”, “root”, “”);

var_dump($link);

?>