PHP Challenges: Find three numbers from an array such that the sum of three consecutive numbers equal to zero

PHP Challenges - 1: Exercise-6 with Solution

Write a PHP program to find three numbers from an array such that the sum of three consecutive numbers equal to zero.

Input : (-1,0,1,2,-1,-4)

Explanation :

Sample Solution :

PHP Code :

<?php
// Function to find triplets whose sum equals zero
function three_Sum_zero($arr)
{
    // Calculate the number of elements in the array minus 2
    $count = count($arr) - 2;
    // Initialize an empty array to store the result
    $result=[];
    // Iterate through the array
    for ($x = 0; $x < $count; $x++) 
    {
        // Check if the sum of the current element and the next two elements equals zero
        if ($arr[$x] + $arr[$x+1] + $arr[$x+2] == 0)
        {
            // If true, push the triplet to the result array
            array_push($result, "{$arr[$x]} + {$arr[$x+1]} + {$arr[$x+2]} = 0");
        }
    }
    // Return the array of triplets whose sum equals zero
    return $result;
}

// Define two arrays of numbers
$nums1= array(-1,0,1,2,-1,-4);
$nums2 = array(-25,-10,-7,-3,2,4,8,10);

// Test the three_Sum_zero function with the defined arrays and print the result
print_r(three_Sum_zero($nums1));
print_r(three_Sum_zero($nums2));
?>

Explanation:

Here is a brief explanation of the above PHP code:

• The code defines a function named 'three_Sum_zero' which takes an array '$arr' as input.
• Inside the function:
• It calculates the number of elements in the array minus 2 and stores it in '$count'
• It initializes an empty array '$result' to store the triplets whose sum equals zero.
• It iterates through the array using a 'for' loop.
• For each iteration, it checks if the sum of the current element and the next two elements equals zero.
• If the condition is true, it formats the triplet as a string and pushes it into the '$result' array.
• Finally, it returns the '$result' array containing all the triplets whose sum equals zero.
• Two arrays '$nums1' and '$nums2' are defined with different sets of numbers.
• The 'three_Sum_zero' function is called twice with these arrays as input.
• The results of the function calls are printed using 'print_r()', which displays the array of triplets whose sum equals zero for each input array.

Sample Output:

Array                                                       
(                                                           
    [0] => -1 + 0 + 1 = 0                                   
)                                                           
Array                                                       
(                                                           
)              

Flowchart:

PHP Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a PHP program to find a missing number(s) from an array.
Next: Write a PHP program to find three numbers from an array such that the sum of three consecutive numbers equal to a given number.