PHP Exercises: Move the last two characters to the start of a given string of length at least two

Last update on December 20 2024 10:20:32 (UTC/GMT +8 hours)

Write a PHP program to move the last two characters to the start of a given string of length at least two.

Sample Solution:

PHP Code :

<?php
// Define a function named 'test' that rearranges the last two characters of a string with the rest of the string
function test($s1)
{ 
    // Use substr to extract substrings and rearrange them
    return substr($s1, strlen($s1) - 2, 2) . substr($s1, 0, strlen($s1) - 2);
}

// Test the 'test' function with different strings and display the results
echo test("Hello")."\n";
echo test("JS")."\n";
?>

Explanation:

Function Definition:

A function named test is defined, which takes one parameter, $s1, representing the input string.

Character Rearrangement:

Inside the function, two substr calls are used to rearrange the characters of the input string $s1:

substr($s1, strlen($s1) - 2, 2) extracts the last two characters of the string.
substr($s1, 0, strlen($s1) - 2) extracts all characters of the string except for the last two.

Concatenation:

The function returns the concatenation of the last two characters (extracted first) followed by the rest of the string (extracted second), effectively moving the last two characters to the front of the string.

Output:

loHel
JS

Flowchart:

PHP Code Editor:

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