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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 :

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

Sample Solution :

PHP Code :

<?php
function length_of_last_word($s)
{
      
        if (strlen(trim($s)) == 0)
        {
            return "Blank String";
        }
        
        $words = explode(' ', $s);
        
        if (sizeof($words) >1)
        return strlen(substr($s, strrpos($s, ' ') + 1));
        else
        return "Single word";
        
        
}
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");
?>

Sample Output: 

9                                                           
Single word                                                 
Blank String                                                
Blank String

Flowchart:

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

PHP Code Editor:

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Previous: Write a PHP program to find majority element in an array.
Next: Write a PHP program to find the single number which occurs odd number of times and other numbers occur even number of times.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC