PHP Challenges: Find the length of the last word in a string

PHP Challenges - 1: Exercise-24 with Solution

Input : PHP Exercises

Write a PHP program to find the length of the last word in a string.

Explanation :

Sample Solution :

PHP Code :

<?php
// Function to calculate the length of the last word in a string
function length_of_last_word($s)
{
    // Check if the string is empty or contains only whitespace characters
    if (strlen(trim($s)) == 0)
    {
        return "Blank String";
    }

    // Split the string into words
    $words = explode(' ', $s);

    // If there are multiple words, return the length of the last word
    if (sizeof($words) > 1)
        return strlen(substr($s, strrpos($s, ' ') + 1));
    else
        return "Single word";
}

// Test cases
print_r(length_of_last_word("PHP Exercises") . "\n");
print_r(length_of_last_word("PHP") . "\n");
print_r(length_of_last_word("") . "\n");
print_r(length_of_last_word("  ") . "\n");
?>

Explanation:

Here is a brief explanation of the above PHP code:

• Function definition (length_of_last_word):
• The function "length_of_last_word()" takes a string ''$s' as input.
• It first checks if the string is empty or contains only whitespace characters. If so, it returns "Blank String".
• Inside the function:
• If the string is not empty or contains only whitespace characters, it splits the string into words using the "explode()" function.
• It checks if there are multiple words in the string. If there are, it extracts the last word using "substr()" and "strrpos()" functions, and returns its length.
• If there's only one word in the string, it returns "Single word".
• Function Call & Testing:
• The "length_of_last_word()" function is tested with different input strings, including strings with multiple words, single word, empty string, and whitespace characters.
• Finally "print_r()" function prints the length of the last word or appropriate message.

Sample Output:

9                                                           
Single word                                                 
Blank String                                                
Blank String   

Flowchart:

PHP Code Editor:

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