# INTRODUCTION

# STATEMENT

IF ELSE syntax :

IF (CONDITION)

{

BLOCK OF CODE TO BE EXECUTED ;

}

ELSE

{

BLOCK OF CODE TO BE EXECUTED ;

}

IF ELSE EXAMPLE :

<?php

$color=”red”;

if($color==”red”)

{

echo “color is red”;

}

else

{

echo “not red color”;

}

?>

PHP – The if…elseif ….else Statement :

Use the if….elseif…else statement to specify a new condition to test, if the first condition is false.

Syntax :

IF (CONDITION)

{

BLOCK OF CODE TO BE EXECUTED ;

}

ELSE IF(CONDITION)

{

BLOCK OF CODE TO BE EXECUTED ;

}

ELSE

{

BLOCK OF CODE TO BE EXECUTED ;

}

Example :

<?php

$color=”red”;

if($color==”red”)

{

echo “color is red”;

}

else if($color==”orange”)

{

echo “color is orange”;

}

else

{

echo “No color:”;

}

?>

The PHP switch Statement

Use the switch statement to select one of many blocks of code to be executed.

Syntax :

Switch (n)

{

Case Label 1:

Code to be executed if n=Label1;

Break;

Case Label 2:

Code to be execute if n=Lable2;

Break;

……..

Default:

Code to be executed if n is different from all Labels;

}

note: here “n” is values which match with all Case Label1, Label2..

Example :

<?php

$color=”white”;

switch($color)

{

case “red”:

echo “color is red”;

break;

case “blue”:

echo “color is blue”;

break;

case “orange”:

echo “color is orange”;

break;

default:

echo “no color”;

break;

}

?>

===================
SIMPLE APPLICATION FOR PRACTICE USING SWITCH SIMPLE CALCULATOR :
(1)write code for form.html:
<html>
<head>
<title>simple calculator</title>
</head>
<body>
<form action=”cal.php” method=”post”>
enter value of a<input type=”text” name=”a”>
enter value of b<input type=”text” name=”b”>
<select name=”cal”>
<option value=”add”>Addition</option>
<option value=”sub”>Subtraction</option>
<option value=”mul”>Multiplication</option>
</select>
<input type=”submit” name=”submit” value=”cal”>
</form>
</body>

</html>
(2)write code for “cal.php” :
<?php
$cal=$_POST[“cal”];
$a=$_POST[“a”];
$b=$_POST[“b”];
if($cal==”add”)
{
$c=$a+$b;
echo”it is addition”.$c;
}
else if($cal==”sub”)
{
$c=$a-$b;
echo”it is subtraction”.$c;
}
else if($cal==”mul”)
{
$c=$a*$b;
echo”it is multiplication”.$c;
}
else
{
echo”no calculation”;
}

?>

OUTPUT:

see output AFTER CLICK ON CAL BUTTON ..