PHP Exercises: Exchange the first and last characters in a given string and return the new string

PHP Basic Algorithm: Exercise-7 with Solution

Write a PHP program to exchange the first and last characters in a given string and return the new string.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes a parameter $str
function test($str) 
{
    // Use a ternary operator to check if the length of $str is greater than 1
    // If true, concatenate the last character with the substring from index 1 to length-2
    // and then concatenate the first character at the end
    // If false, return $str as it is
    return strlen($str) > 1 ? substr($str, strlen($str) - 1) . substr($str, 1, strlen($str) - 2) . substr($str, 0, 1) : $str;
}

// Call the test function with argument "abcd" and echo the result
echo test("abcd") . "\n";

// Call the test function with argument "a" and echo the result
echo test("a") . "\n";

// Call the test function with argument "xy" and echo the result
echo test("xy") . "\n";
?>

Sample Output:

dbca
a
yx

Visual Presentation:

Flowchart:

PHP Code Editor:

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