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 Variable and Constant in PHP:-


Variable:-  It is the special identifier in PHP whose value can be changed. variable always will be declared using alphabets.

PHP variable will be started from $ symbol.

Syntax of Variable Declaration in PHP

$identifier=value

$a=10;       //Integer Type Variable

$b="10";    //Numeric String

$c = '10';   //Numeric String

$d = 10.0;     //Float Value


PHP provides a loosely coupled declaration for variable means no need to write data type on the variable declaration, it will be managed by assigned data.
 using this concept we can use a single name variable for multiple values.



$a=10;

$a = "abc";

$a =True;

mobile no = "9812311111"  //incorrect

mobile_no= "981233444"  //correct

1a = 10   // incorrect
a1=10  //correct


note:-  space,numeric,keyword,capital letter,special char not allowed in variable declaration.






 WAP to calculate Simple Interest in PHP?

<?php
echo "<h1>SI Program</h1>";
echo "<hr>";
$p=12000;
$r=2.2;
$t=2;
$si = ($p*$r*$t)/100;

echo "p=$p,r=$r,t=$t,result=$si ";

//echo $p,$r,$t,$si;

?>



Constant in PHP:-


we can not change the value of the identifier in the program using constant.

in PHP constant will be defined by define() and access by without $ symbol.

Syntax of Constant in PHP:-

define('identifier',value)


define(a,100)   
define(b,200)

define(a,20)  //error because we can not change value of constant
echo a;
echo b;


Example of Constant in PHP?
<?php

define('a',100);
define('b',200);
#define('a',10);
echo a+b;

?>

WAP to swap two number with using the third variable:-

<?php

$a=10;
$b=20;
echo $a,$b,"<br>";
$temp=$a;
$a=$b;
$b=$temp;
echo $a,$b;
?>

Variable and Constant in PHP

Assignment of PHP:-

1) WAP to Swap Two Number Without Using Third Variable?

<?php

$a=100;
$b=20;
echo $a,", ",$b,"<br>";
$a=$a+$b;  //120
$b=$a-$b;  //100
$a=$a-$b;  //20
echo $a," ," ,$b;
?>

2) WAP to Calculate Square and Cube of any number?

<?php

$num=5;

$sq = $num*$num;
$cb = $num*$num*$num;
echo "Square is ",$sq;
echo "Cube is ",$cb;
?>

3) WAP to Calculate Area of Circle?

4) WAP to Calculate Area of Triangle?

5) WAP to convert temperature from Celsius to Fahrenheit?


 

20 Comments

POST Answer of Questions and ASK to Doubt

  1. shadab shah

    $a=8;
    $b=14;
    echo $a,",",$b,"
    ";
    $a=$b+$a;
    $b=$a-$b;
    $a=$a-$b;
    echo $a,",",$b;

    ReplyDelete
  2. Aamir Uddin
    $a=16;
    $b=4;
    echo $a,",",$b,"
    ";
    $a=$a+$b; //20
    $b=$a-$b; //16
    $a=$a-$b; //4
    echo $a,",",$b;

    ReplyDelete
  3. Aamir Shaikh
    How to calculate area of tringle
    <?php
    $base=21;
    $height=23;
    echo "area with base $base and height $height=". ($base*$height)/2;



    ?>

    ReplyDelete
  4. Shadab Shah
    How to Convert Celsius to Fahrenheit


    ReplyDelete
  5. Aamir Shaikh
    How to Calculate the area of Circle


    ReplyDelete
  6. Mansi Dubey

    <?php
    $r=5;
    $area_of_circle=(3.14*$r*$r);
    echo "Area of circle is = ".$area_of_circle;
    ?>

    ReplyDelete
  7. Mansi Dubey

    <?php
    $r=5;
    $area_of_circle=(3.14*$r*$r);
    echo "Area of circle is = ".$area_of_circle;
    ?>

    ReplyDelete
  8. Mansi Dubey

    <?php
    $r=5;
    $area_of_circle=(3.14*$r*$r);
    echo "Area of circle is = ".$area_of_circle;
    ?>

    ReplyDelete
  9. Mansi Dubey

    <?php
    $base=100;
    $height=50;
    $area_of_triangle=(1/2*$base*$height);
    echo "Area of triangle is = ".$area_of_triangle;
    ?>

    ReplyDelete
  10. Mansi Dubey

    <?php
    $C=32;
    $F=$C*1.8+32;
    echo "Temperature in Fahrenheit = ".$F;
    ?>

    ReplyDelete
  11. Kritika Barod

    Calculate Area of Circle--

    Area of Circle is A=$A";
    ?>

    ReplyDelete
  12. Kritika Barod

    convert temperature from Celsius to Fahrenheit

    ";
    $f=($t*9/5)+32;
    echo "F is=$f";
    ?>

    ReplyDelete
  13. ";
    echo "area of circle is - $A";

    ?>

    ReplyDelete
  14. Calculate Area of Triangle

    $b=10;
    $h=12;


    $at = ($b*$h)/1/2;

    echo "Area of Triangle is ".$at;
    echo ("
    ") ;
    echo ("
    ") ;
    echo"The Formula of Area of Triangle is =(b*h)/1/2";

    ReplyDelete
  15. Area of Circle

    define('a',3.142);
    $num=5;
    $sq=$num*$num;
    $a= a*$sq;
    echo ("
    ");

    echo "Area of Circle is " .$a;

    ReplyDelete
  16. Celsius To Fahrenheit Converter

    $c=6;
    $f=(($c*9)/5)+32;

    echo "Celcius to Fahrenheit Converter";
    echo ("
    ");
    echo ("
    ");
    echo ("
    ");
    echo "$c Degree Celcius Temperature is Equal To ". $f , "", ' Fahrenheit';

    ReplyDelete
  17. //area of rectangle
    $l=10;
    $b=20;
    $area=$l*$b;
    echo("Area of rectangle is:-" .$area);

    ReplyDelete
  18. // area of triangle
    $base=20;
    $height=10;
    $t_area=($base*$height)/2;
    echo("
    ");
    echo("Area of triangle:-" .$t_area);

    ReplyDelete
  19. // area of circle
    $r=5;
    define('pi',3.14);
    $c_area=pi*$r*$r;
    echo("
    ");
    echo("Area of circle:-" .$c_area);

    ReplyDelete
  20. // program to convert temperature from Celsius to Fahrenheit fahrenheit = (celsius * 1.8) + 32
    $c=37;
    $f=$c*1.8+32;
    echo("
    ");
    echo("Temperature in celsius:-" .$f);

    ReplyDelete

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