PHP | PHPSTORM | KEYWORDS |TYPES OF DATATYPES

PHP KEYWORDS 

There are 24 keywords in php. php keywords are case sensetive. the following php keywords are

1. break
2. case
3. catch
4. do 
5. class
6. function
7. elseif
8. public
9. throw
10. for
11. endfor
12. extends
13. if
14. new
15. static
16. try
17. exception
18. while
19. endwhile
20. exit
21. else
22. or
23. switch
24. var 

PHP DATATYPES

there are 8 datatype in php as follow

1. integer
2. float
3. string
4. boolean
5. null
6. resource
7. array
8. object 

• SCALAR DATATYPE - integer, float, string, boolean.                         
• SPECIAL DATATYPE - null, resource.                                    
• COMPOUND DATATYPE - array,object.

1. INTEGER 
      

   

     An integer data type is a non decimalnumber  for e.g-

<?php

$a=10;

var_dump($a);

?>

output - int 10

2. FLOAT

Float ia a number with decimal point for e.g-

<?php

$a=10.5;

var_dump($a);

?>

output - float 10.5

3. STRING

A string is a sequence of character. A string can be any type inside codes either double code or single code. for e.g-

<?php

$a='hello';

var_dump($a);

?>

output - string hello

                                                    OR

<?php

$a="hello"

var_dump($a);

?>

output - string hello

there are four type of string in php follow as-

1.single qouted string

In this string the string enclosed with single code.

<?php

$a='hello';

var_dump($a);

?>

2.double qouted string

in this string the string enclosed with double code.

<?php

$a="hello";

var_dump($a);

?>

3.heredoc

In this string the string use multiline string with double code.

<?php

$a="hello how are you i am fine what about you";

var_dump($a);

?>

4.nowdoc 

In this string the string use multiline string with single code.

<?php

$a='hello how are you i am fine what about you';

var_dump($a);

?>

4. BOOLEAN

A boolean represent two possible states either true or false. for eg-

<?php

$a=10;

if($a%2==0)

{
true;

}
else

{
false;

}
?>

output - true

5. NULL

Null is a special datatype which can have only one values that is null. and if a variable is created without the value it is automatically assigned a value null. for e.g-

<?php

$a=Null;

var_dump($a);

?>

output - Null

                                                  OR

<?php

$a="";

var_dump($a);

?>

output - Null

6. RESOURCE

A resource is a not  actual data type it is use for storing a refference to a function.

7. ARRAY

An array stores multiple values in one single variable. for eg-

<?php

$cars=Array("bmw","alto","swift","audi";

var_dump($cars);

?>

output - array([0]=>bmw,[1]=>alto,[2]=>swift,[3]=>audi)

In php there are two types of array -

1. Index array

In index array only have values.

<?php

$cars=Array("bmw","alto","swift","audi";

var_dump($cars);

?>

output - array([0]=>bmw,[1]=>alto,[2]=>swift,[3]=>audi)

2.Associative arry

In associative array have key and values.

<?php

$cars=array([0]=>bmw,[1]=>alto,[2]=>swift,[3]=>audi)

var_dump($cars);

?>

output - array([0]=>bmw,[1]=>alto,[2]=>swift,[3]=>audi)

8. OBJECT

object is a real word entity. it is blue print of class. it is used access to the class. for eg-

<?php

class demo

{
Function Display()

{
$a='hello';

var_dump($a);

}
}
$d=new demo();

$d=>display() ;

?>