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PHP Parametrized Function


Parametrized function in PHP

Parametrized function are used at run time of the program when output depends on dynamic values given at run time

There are two ways to access the parametrized function:

call by value : (here we pass the value directly )

call by reference : (here we pass the address location where the value is stored)

The following example will write different first names, but equal last name

<?php

function writeName($fname)  

{

echo $fname ."<br>";

}

echo "My name is ";

writeName("Durgesh Pandey");

echo "My sister's name is ";

writeName("Poonam pandey");

echo "My brother's name is ";

writeName("Monu Pandey");
 
?>

Output My name is Durgesh Pandey My sister's name is Poonam pandey My brother's name is Monu Pandey

in the above example1 There is a parametrized function named writeName() that contains 1 parameter . In the first line we have printed a string message.and in the second line we have called the function along with the parameter value. The given example add( ) and sub( ) has two parameters so pass two argument when call add( ) function and sub( )function.

<?php

//create add() function with two parameter
function add($x,$y)  
{

$sum=$x+$y;

echo "Sum=".$sum."<br>";

}

//create sub( ) function with two parameter

function sub($a,$b)  

{

$sub=$a-$b;

echo "Sub=".$sub;

}
	
//call function,  passing two argument
add(1000,2000);

sub(1500,500);

?>
Output Sum=3000 Sub=1000

in the example2 there are two parametrized function namely add() and sub() both containing two parameters. at the time of calling these function , we have passed both these arguments.

Create dynamic add( ) and sub( ) function
<?php

//create add() function with two parameter
function add($x,$y)  

{

$sum=$x+$y;

echo "Sum=".$sum."<br>";

}

//create sub( ) function with two parameter
function sub($a,$b)  

{

$sub=$a-$b;

echo "Sub=".$sub;

}
	
//call function,get  two argument through input box when click on add or sub button
if(isset($_POST['add']))

{

//call add() function
 add($_POST['f'],$_POST['s']);

}
	
if(isset($_POST['sub']))

{

//call add() function
sub($_POST['f'],$_POST['s']);

}

?>

<form method="post">

Enter first number <input type="text" name="f"/><hr/>

Enter second number <input type="text" name="s"/><hr/>

<input type="submit" name="add" value="ADD"/>

<input type="submit" name="sub" value="SUB"/>
 
</form>	
		
Output Enter second number

in example 3 there are two parametrized function namely add() and sub() both containing two parameters. at the time of calling these function , we have passed both these arguments by using HTML form. there are 2 buttons add and sub .the output of the program is based upon the clicking of button by the user at run time. i.e if user click on add button the add function get called.

Function Return type

To let a function return a value, use the return statement.

<?php
 
//create add() function with two parameter
function add($x,$y)  

{

$sum=$x+$y;

return $sum;

}

echo "84 + 16 = " . add(84,16);

?>

Output 84 + 16 = 100
Make your own library and call it on another pages.

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