PHP Exercises: Create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1

Last update on May 28 2025 13:07:38 (UTC/GMT +8 hours)

59. String Pattern: s1s2s2s1

Write a PHP program to create a new string using two given strings s1, s2, the format of the new string will be s1s2s2s1.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that concatenates two strings in a specific order
function test($s1, $s2)
{
    // Concatenate the strings in the order: s1 + s2 + s2 + s1
    return $s1 . $s2 . $s2 . $s1;
}

// Test the 'test' function with different input strings and display the results
echo test("Hi", "Hello")."\n";
echo test("whats", "app");
?>

Explanation:

Function Purpose:

The test function takes two string parameters, $s1 and $s2, and concatenates them in a specific order: $s1 . $s2 . $s2 . $s1.

Concatenation Logic:

The function returns a single string that combines the inputs in the order: s1 + s2 + s2 + s1.
This means $s1 is placed at the beginning and end, with $s2 repeated twice in the middle.

Output:

HiHelloHelloHi
whatsappappwhats

Flowchart:

For more Practice: Solve these Related Problems:

Write a PHP script to concatenate two strings into a mirrored pattern, forming the sequence s1s2s2s1.
Write a PHP function to merge two strings by sandwiching one between two copies of the other in a symmetric order.
Write a PHP program to output a composite string pattern that mirrors two given inputs.
Write a PHP script to generate a new string by concatenating two input strings in a fixed symmetrical format.

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