PHP Exercises: Check a given array of integers and return true if the given array contains two 5's next to each other, or two 5 separated by one element

Last update on May 28 2025 13:07:12 (UTC/GMT +8 hours)

117. Array Contains Two 5's Next to or Separated by One

Write a PHP program to check a given array of integers and return true if the given array contains two 5's next to each other, or two 5 separated by one element.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($numbers)
 { 
    // Calculate the length of the array
    $len = sizeof($numbers);

    // Iterate through the elements of the array up to the second-to-last element
    for ($i = 0; $i < $len - 1; $i++)
    {
        // Check if there are consecutive occurrences of 5 and 5
        if ($numbers[$i] == 5 && $numbers[$i + 1] == 5) return true;

        // Check if there are non-consecutive occurrences of 5 and 5 with one element in between
        if ($i + 2 < $len && $numbers[$i] == 5 && $numbers[$i + 2] == 5) return true;
    }

    // Return false if there are no consecutive or non-consecutive occurrences of 5 and 5
    return false;
 }   

// Use 'var_dump' to print the result of calling 'test' with different arrays
var_dump(test([5, 5, 1, 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 check if an array contains two 5's either directly adjacent or separated by one element.
Write a PHP function to detect patterns where the number 5 occurs with at most one number between occurrences.
Write a PHP program to iterate through an array and use index comparisons to determine if two 5's are close enough according to the specified criteria.
Write a PHP script to implement conditional checks that return true if a valid pair of 5's is found with a gap of zero or one element.

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