PHP Program to find sum of even index term

This is a basic PHP Program to find sum of even index term. Below examples will help you in the better understanding of the basic concept of PHP programming language.

PHP Program of finding nth Delannoy Number

We are using the if…else statement to determine the number of the days in a current month. Copy the below code and execute it with the help of PHP compiler.

<?php
/**
* PHP Program to find sum of even index term
*/

function evenSum($n) 
{ 
    $C = array(array()); 
    $i; $j; 
  
    // Calculate value of Binomial
    for ($i = 0; $i <= $n; $i++)  
    { 
        for ($j = 0; $j <= min($i, $n); $j++) 
        { 
            // Base Cases 
            if ($j == 0 or $j == $i) 
                $C[$i][$j] = 1; 
  
            else
                $C[$i][$j] = $C[$i - 1][$j - 1] +  
                             $C[$i - 1][$j]; 
        } 
    }  
  
    // finding sum of even index term. 
    $sum = 0; 
    for ( $i = 0; $i <= $n; $i += 2) 
        $sum += $C[$n][$i]; 
  
    return $sum; 
} 
  
echo evenSum(4);

<?php

/**

* PHP Program to find sum of even index term

function evenSum($n)

{

$C = array(array());

$i; $j;

// Calculate value of Binomial

for ($i = 0; $i <= $n; $i++)

{

for ($j = 0; $j <= min($i, $n); $j++)

{

// Base Cases

if ($j == 0 or $j == $i)

$C[$i][$j] = 1;

else

$C[$i][$j] = $C[$i - 1][$j - 1] +

$C[$i - 1][$j];

}

// finding sum of even index term.

$sum = 0;

for ( $i = 0; $i <= $n; $i += 2)

$sum += $C[$n][$i];

return $sum;

}

echo evenSum(4);

Output

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PHP Program to find sum of even index term

PHP Program of finding nth Delannoy Number

Output

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