PHP Exercises: Check a given array of integers, length 3 and create a new array

PHP Basic Algorithm: Exercise-98 with Solution

Write a PHP program to check a given array of integers, length 3 and create a new array. If there is a 5 in the given array immediately followed by a 7 then set 7 to 1.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that takes an array of numbers as a parameter
function test($numbers)
 { 
    // Iterate through the array up to the second-to-last element
    for ($i = 0; $i < sizeof($numbers) - 1; $i++)
    {
        // Check if the current element is 5 and the next element is 7
        if ($numbers[$i] == 5 && $numbers[$i + 1] == 7)
            // If true, set the value of the next element to 1
            $numbers[$i + 1] = 1;
    }
    // Return the modified array
    return $numbers;
 }   

// Create an array $a with numeric values
$a = [1, 5, 7];

// Print the original array as a string using 'implode' and 'echo'
echo "Original array: " . implode(',', $a) . "\n";

// Call the 'test' function with the array $a and store the result in $result
$result = test($a);

// Print the new array after applying the modification using 'implode' and 'echo'
echo "New array with maximum values: " . implode(',', $result);
?>

Explanation:

• Function Definition:
• A function named test is defined, which takes one parameter:
• $numbers: an array of numbers.
• Loop through Array:
• The function uses a for loop to iterate through the array, stopping at the second-to-last element ($i < sizeof($numbers) - 1).
• Condition Check:
• During each iteration, the function checks if:
• The current element is 5 ($numbers[$i] == 5).
• The next element is 7 ($numbers[$i + 1] == 7).
• If both conditions are true, the next element is set to 1 ($numbers[$i + 1] = 1).
• Return Modified Array:
• The function returns the modified version of the array.

Output:

Original array: 1,5,7
New array with maximum values: 1,5,1

Flowchart:

PHP Code Editor:

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