PHP Function definition within in a class

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PHP CODE

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<?php
// function definition within in a class

class common
{

function addition($a,$b)
{
echo "<br/> Sum of the " . $a . " and  " . $b . " is : " . ( $a + $b ) ;
}

function multiplication($a,$b)
{
echo "<br/> Multiplication of the " . $a . " and  " . $b . " is : " . ( $a * $b ) ;
}
}
// function defination within in a class
// object creation for class
$com1 = new common();
// object creation for class
// function call via class's object
$com1->addition(2,3);
$com1->multiplication(2,3);
// function call via class's object
?>

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                       OUTPUT of the CODE

                   ########################

Sum of the 2 and 3 is : 5

Multiplication of the 2 and 3 is : 6