PHP String Exercises : Change the case of letters or words

Last update on May 30 2022 11:42:04 (UTC/GMT +8 hours)

PHP String: Exercise-1 with Solution

Write a PHP script to : -

a) transform a string all uppercase letters.
b) transform a string all lowercase letters.
c) make a string's first character uppercase.
d) make a string's first character of all the words uppercase.

Pictorial Presentation:

PHP String Exercises: Change the case of letters or words

Sample Solution:

PHP Code:

<?php
//all uppercase letters
print(strtoupper("the quick brown fox jumps over the lazy dog."))."\n";
//all lowercase letters
print(strtolower("THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG"))."\n";
// make a string's first character uppercase
print(ucfirst("the quick brown fox jumps over the lazy dog."))."\n";
// make a string's first character of all the words uppercase
print(ucwords("the quick brown fox jumps over the lazy dog."))."\n";
?>

Sample Output:

THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.                
the quick brown fox jumps over the lazy dog                 
The quick brown fox jumps over the lazy dog.                
The Quick Brown Fox Jumps Over The Lazy Dog.

Flowchart :

PHP Code Editor:

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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