PHP Exercises: Check if an array of integers contains a 3 next to a 3 or a 5 next to a 5 or both

Last update on May 28 2025 13:04:42 (UTC/GMT +8 hours)

116. Contains Adjacent 3's or 5's Check

Write a PHP program to check if an array of integers contains a 3 next to a 3 or a 5 next to a 5 or both.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($numbers)
 { 
    // Iterate through the elements of the array up to the second-to-last element
    for ($i = 0; $i < sizeof($numbers) - 1; $i++) 
    {	
        // Check if there are consecutive occurrences of either 3 and 3 or 5 and 5
        if (($numbers[$i] == 3 && $numbers[$i + 1] == 3) || ($numbers[$i] == 5 && $numbers[$i + 1] == 5)) 
            return true;
    }
    
    // Return false if there are no consecutive occurrences of either 3 and 3 or 5 and 5
    return false;
 }   

// Use 'var_dump' to print the result of calling 'test' with different arrays
var_dump(test([5, 5, 5, 5, 5]));
var_dump(test([1, 2, 3, 4]));
var_dump(test([3, 3, 5, 5, 5, 5]));
var_dump(test([1, 5, 5, 7, 8, 10]));
?>

Sample Output:

bool(true)
bool(false)
bool(true)
bool(true)

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to verify if an array contains at least one pair of adjacent 3's or a pair of adjacent 5's.
Write a PHP function to scan through an array and return true if two identical numbers (either 3 or 5) appear consecutively.
Write a PHP program to use a loop to check each pair of adjacent elements for the values 3 or 5, returning a boolean if found.
Write a PHP script to determine if the array contains consecutive identical pairs of 3’s or 5’s by comparing indices.

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PHP Code Editor:

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