PHP Exercises: Changes the color of first character of a word

Last update on May 30 2022 11:50:05 (UTC/GMT +8 hours)

PHP: Exercise-9 with Solution

Write a PHP script, which changes the color of the first character of a word.

Sample string : PHP Tutorial

Sample Solution: -

PHP Code:

<?php
$text = 'PHP Tutorial';
$text = preg_replace('/(\b[a-z])/i','<span style="color:red;">\1</span>',$text);
echo $text;
?>

Sample Output:

PHP Tutorial

View the output in the browser

preg_replace() function:

Syntax:

mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )

Searches subject for matches to pattern and replaces them with replacement. The function returns an array if the subject parameter is an array, or a string otherwise. If matches are found, the new subject will be returned, otherwise subject will be returned unchanged or NULL if an error occurred.

Flowchart:

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Previous: Write a PHP script, which will return the following components of the url 'https://www.w3resource.com/php-exercises/php-basic-exercises.php'.
Next: Write a PHP script, to check whether the page is called from 'https' or 'http'.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

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