Description
Normally, in PHP we no need to represent the data type to a variable, depending on variable value, it converts the correct data type to variable automatically.
PHP supports following Data Types:
- Integer
- String
- Float or double
- Array
- Boolean
- Null
- Object
Description
Integer is a positive or negative number without decimal value. Integer is of only number, without comma and decimal value.Integers can be defined in three different formats:
- Decimal (base-10)
- Hexadecimal (base 16 – prefixed with 0x)
- Octal (base 8 – prefixed with 0)
Example: The function var_dump() returns the data type and value.
[php]
<?php
$a = 258;
var_dump($a);
?>
[/php]
Description
String is a collection of characters.The string can be enclosed in single or double quotes.
Example:
[php]
<?php
$a = "Welcome to SPLessons!";
$b = ‘Welcome to SPLessons!’;
echo $a;
echo "<br>";
echo $b;
?>
[/php]
Description
The numeric value, which consists of decimal value called as floating value.
Example:
[php]
<?php
$a = 25.365;
var_dump($a);
?>
[/php]
Description
Boolean is a data type which represents
true or false.
Example:
[php]
$a = true;
$b = false;
[/php]
Description
Array is a collection of variables, which stores different variable values as a single array.
array() keyword is used to define an array.
Example:
[php]
<?php
$operating_systems = array("Windows","Linux","Unix");
var_dump($operating_systems);
?>
[/php]
Description
Null represents no value, this is a special data type which don’t assign any value to the variable.Any variable without any value assigned to it tends to NULL value.
[php]
<?php
$a = "Welcome to SPLessons!!";
$a = null;
var_dump($a);
?>
[/php]
Description
Object data type is used to store a data. object data type, must create a class where Class is a structure of methods and it’s properties.
[php]
<?php
class OS {
function OS() {
$this->model = "Linux";
}
}
// create an object
$version = new OS();
// show object properties
echo $version->model;
?>
[/php]
Collective
Example
[php]
<!DOCTYPE html>
<html>
<body>
<?php
$a = 5896;
var_dump($a);
echo "<br><br>";
$b = 10.365;
var_dump($b);
echo "<br><br>";
$c = "Hello world!";
echo $c;
echo "<br><br>";
$operating_systems = array("Windows","Linux","Unix");
var_dump($operating_systems);
echo "<br><br>";
$d = "Welcome to SPLessons!!";
$d = null;
var_dump($d);
?>
</body>
</html>
[/php]
Output:
Key Points
- PHP Data Types are of various types like Integer,String,Float or double,Array,Boolean,Null and Object.