PHP Exercises: Create a new string with the last char added at the front and back of a given string of length 1 or more

PHP Basic Algorithm: Exercise-9 with Solution

Write a PHP program to create a new string with the last char added at the front and back of a given string of length 1 or more.

Sample Solution:

PHP Code :

<?php
// Define a function named "test" that takes a parameter $str
function test($str) 
{
    // Use the substr function to get the last character of $str
    $s = substr($str, strlen($str) - 1);
    
    // Concatenate the last character, $str, and the last character again, then return the result
    return $s . $str . $s;
}

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

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

// Call the test function with argument "1" and echo the result
echo test("1") . "\n";
?>

Explanation:

• Function Definition:
• The function test takes one parameter, $str.
• Extracting the Last Character:
• Uses substr($str, strlen($str) - 1) to get the last character of $str and assigns it to $s.
• Concatenation:
• Concatenates $s (last character), $str (the original string), and $s (last character again) to create a new string with the last character at both the beginning and end.
• Returns this concatenated result.
• Function Calls and Output:
• First Call: test("Red")
• Last character is "d", so the result is "dRedd".
• Second Call: test("Green")
• Last character is "n", so the result is "nGreenn".
• Third Call: test("1")
• Last character is "1" (the only character), so the result is "111".

Output:

dRedd
nGreenn
111

Visual Presentation:

Flowchart:

PHP Code Editor:

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