PHP Data Types

PHP data type is used to hold the various types of data or value.  There are three types of data types in PHP. It is a loosely data typed language, so there is no need to declare data type like int,float etc. InPHP,there are some function to check data type and its value.

• gettype(): It is used to check only data type.
• var_dump(): It is used to check the size and data type.

Example1:

<?php
$var = 60;
echo "60 is: ".gettype($var);
echo "<br>";
// ------------------------------
$var = 1000.56;
echo "1000.56 is: ".gettype($var);
echo "<br>";
// ------------------------------
$var = "PHP";
echo "PHP is: ".gettype($var)
?>

Output 60 is: integer 1000.56 is: double PHP is: string Example2

<?php
$num=100;
$str="Hello PHP";
$f=3.40;
var_dump($num);
var_dump($str);
var_dump($f);
 //var_dump($num,$str,$f);
?>

Output int(100) string(9) "Hello PHP" float(3.4) Example of Array:

<?php
$cars = array("You","Are","Good_Developer!");
var_dump($cars);
?>

Output array(3) { [0]=> string(3) "You" [1]=> string(3) "Are" [2]=> string(14) "Good_Developer" } Example of Object.

<?php
class Course {
function Course() {
        $this->Course = "PHP";
    }
}
// create an object
$lang = new Course();
// show object properties
echo $lang->Course;
?>

Output PHP Example5.

<?php
$x = "Hello PHP!";
$x = null;
var_dump($x);
?>

Output NULL Example: 6

<?php
$con = mysqli_connect("localhost","root","","users");
?>

Note: It is used in database. Following are the predefine functions to Check data type

Predefine Data type	Description
is_int( )	To check the value is integer or not.
is_float( )	To check the value is float or not.
is_numeric( )	To check the value is either integer or float.
is_string( )	To check the value is string or not.
is_bool( )	To check the value is Boolean or not.
is_object( )	To check the value is object or not.
is_null( )	To check the value is null or not.