PHP

Data Types and Built in functions

PHP supports 8 data types

  1. scalar data types( A variable in which only one value can be stored at a time
    1. Boolean
    2. integer
    3. Float / Double
    4. String
  2. Compound data type (A variable in which multiple values can be stored)
    1. Array
    2. Object
  3. Special data types
    1. resource
    2. Null

The type of variable is not set by the programmer, rather it is decided at run type byPHP depending upon the context in which the variable is used.

Var_dump (Var_name):-

it is built in function of PHP used to getting the type of variable with content of variable

<?PHP 
$X= 10; 
var_dump($X); 
echo" <br>” 
$X= 10.65; 
var_dump($X); 
echo" <br>” 

$X= "PSD"; 
var_dump($X); 
echo" <br>” 

$X= true; 
var_dump($X); 
echo" <br>”


The output Will be :-


int(10)
float(10.65)
string(3)(PSD)
bool True


Gettype(var_name):

It is also an Built in function in PHP it is used to get the type of variable.


<?php
$a=10;
$b=11.23;
$c="PSD";
$d=true;
echo gettype($a)."--".gettype($b)."--".gettype($c)."--".gettype($d);
?>

The output will be :

integer--double--string--boolean


Settype(var_name)

It is also an Built in function in PHP it is used to change the type of variable.


<?php
< ?php $a=10; settype($a,"integer"); echo $a ."--".gettype($a); ?>

The output will be :
10--integer


I will explain about notice error in the next class


Unset(var_name)

It is also an Built in function in PHP it is used to removing the content from variable.


<?php
< ?php
$a="psd";
echo gettype($a)."
";
unset($a);
echo gettype($a);
?>

The output will be :
string
NULL

		
		
	

	
	
	
	
	

		
	
	

					
					
								
				

    
    

        
By Sunil

    
                
View all articles by 


    

    



		
		    

        
Related Articles

        
    

    
You Might Also Like