PHP supports eight data types:
· Integer
· Float
· String
· Boolean
· Array
· Object
· Null
· Resource
PHP integer
An integer data types is a non-decimal number between -2,147,483,648 and 2,147,483,648.They correspond to simple whole numbers , both positive and negative.
Integers can be specified in three formats:
· Decimal(10-based),
· Hexadecimal(16-based-prefixed with 0x)
· Octal(8-based-prefixed with 0)
In the following examole $y is an integer:
<?php
$y=10;
Var_dump($y); // This function returns the data type and value
?>
Result:
|
|
PHP String:
A string is a sequence of character,Following is a valid string example:
<?php
$a=”Hello”;
$b=”world!”;
echo $a;</br>//echo function is used to print
echo $b;
?>
Output:
Hello
World!
PHP Float
Floating point numbers are also called as double.It has a decimal point or exponential number.
Following is a valid float example:
<?php
$x=6.55;
$y=3.35;
$x=$x+$y;
print($z);
?>
Result:
9.9
PHP Boolean:
A boolean has two values:true or false.
$a=true;
$b=false;
PHP Array
An array is a data structure that store one or more similar type of values in 0ne variable.For example if you want to store 5 numbers in one variable you can use array.
<?php
$x=array(“Ram”,”Shyam”,”Neha”,”Shikha”,”Shalini”);
var_dump($x); // This function returns the data type and value
?>
Result:
array(5) { [0]=> string(3) "Ram" [1]=> string(5) "Shyam" [2]=> string(4) "Neha" [3]=> string(6) "Shikha" [4]=> string(7) "Shalini" }
PHP Null
Null data type is a variable in which no value is assigned.
It can only have one value: Null
<?php
$a=10;
$a=null;
var_dump($a); // This function returns the data type and value
?>
Result:
NULL
PHP Object
In PHP,object must be declare explicitly.
Following is a valid object example:
<?php
class text{
function text(){
$this->model = "Hello world";
}
}
$text=new text();// create an object
var_dump($text); // show object properties
?>
Result:
object(text)#1 (1) { ["model"]=> string(11) "Hello world" }
PHP Resource
The special resource type is not an actual data type. It is the strong of a reference to functions and resources external to PHP.
Decision Making
The if..else..elseif are used to take decision based on some conditions.
This is how decision making statements works:
There are three types of decision making statements:
If..else:Code is executed if condition is true and another code if condition is false.Let’s see some example:
<?php
$x=10;
If($x)
{
echo("if condition is executed");
}
else
{
echo("else condition is executed");
}
?>
Result:
If condition is executed
Elseif:this statement is used when you have to execute some code if one of the several conditions are true.
<?php
$d = date("D");
if ($d == "Sat")
echo "Have a nice weekend!";
elseif ($d == "Sun")
echo "Have a nice Sunday!";
else
echo "Have a nice day!";
?>
Result:
Have a nice weekend!
Switch Statement:The switch statement is used to avoid long blocks of if..elseif code.
<?php
$name = "Ram";
switch ($name) {
case "Ram":
echo "My name is Ram!";
break;
case "blue":
echo "My name is Shyam!";
break;
case "green":
echo "My name is Rakhi!";
break;
default:
echo "Your name is neither Ram,Sham nor Rakhi!";
}
?>
Result:
My name is Ram!