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PHP Exercises, Practice, Solution

What is PHP?

PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.

The best way we learn anything is by practice and exercise questions. We have started this section for those (beginner to intermediate) who are familiar with PHP.

Hope, these exercises help you to improve your PHP coding skills. Currently, following sections are available, we are working hard to add more exercises. Happy Coding!

Note: It's fine if you are playing around with PHP codes with the help of an online PHP editor, to enjoy a full-fledged PHP environment (since online editors have several caveats, e.g. embedding PHP within HTML) up and running on your own machine is much better of an option to learn PHP. Please read our installing PHP on Windows and Linux if you are unfamiliar to PHP installation.

List of PHP Exercises :

PHP Challenges :

Note : You may accomplish the same task (solution of the exercises) in various ways, therefore the ways described here are not the only ways to do stuff. Rather, it would be great, if this helps you anyway to choose your own methods.

Popularity of Programming Language
Worldwide, Jul 2022 compared to a year ago:

`
Rank Change Language Share Trend
1 Python 28.38 % -2.3 %
2 Java 17.5 % -0.7 %
3 Javascript 9.29 % +0.1 %
4 C# 7.63 % +0.5%
5 C/C++ 6.48 % -0.1 %
6 PHP 5.32 % -1.0 %
7 R 4.13 % +0.4 %
8 up arrow TypeScript 2.55 % +0.8 %
9 down arrow Objective-C 2.13 % +0.3 %
10 up arrow Swift 1.95 % +0.3 %
11 up arrow Go1.7% +0.2 %
12 Matlab 1.67 % +0.2 %
13 down arrow Kotlin 1.58 % -0.2 %
14 up arrow Rust 1.29 % +0.5 %
15 down arrow VBA 1.13 % -0.1%
16 down arrow Ruby 1.09 % -0.0 %
17 up arrow Ada 0.86 % +0.3 %
18 up arrow Scala 0.78 % +0.3 %
19 down arrow Visual Basic 0.71 % -0.0 %
20 down arrow Dart 0.64 % +0.0 %
21 down arrow Abap 0.56 % +0.0 %
22 down arrow Lua 0.53 % +0.1 %
23 Groovy 0.45 % +0.0 %
24 down arrow Julia 0.43 % +0.1 %
25 down arrow Perl 0.38 % +0.0 %
26 Cobol 0.35 % +0.0 %
27 Haskell 0.31 % +0.1 %
28 Delphi/Pascal 0.18 % +0.2 %

Source : https://pypl.github.io/PYPL.html

TIOBE Index for July 2022

July 2022 July 2021 Change Programming Language Ratings Change
1 3 up arrow Python 13.44% +2.48%
2 1 down arrow C 13.13% 1.50%
3 2 down arrow Java 11.59% +0.40%
4 4 C++ 10.00% +1.98%
5 5 C# 5.65% +0.82%
6 6 Visual Basic 4.97% +0.47%
7 7 JavaScript 1.78% -0.93%
8 9 up arrow Assembly language 1.65% -0.76%
9 10 up arrow SQL 1.64% +0.11%
10 16 up arrow Swift 1.27% +0.20%
11 8 down arrow PHP 1.20% -1.38%
12 13 up arrow Go 1.14% -0.03%
13 11 down arrow Classic Visual Basic 1.07% -0.32%
14 20 up arrow Delphi/Object Pascal 1.06% +0.21%
15 17 up arrow Ruby 0.99% +0.04%
16 21 up arrow Objective-C 0.94% +0.17%
17 18 up arrow Perl 0.78% -0.12%
18 14 down arrow Fortan 0.76% -0.36%
19 12 down arrow R 0.76% -0.57%
20 19 up arrow MATLAB 0.73% -0.15%

Source : https://www.tiobe.com/tiobe-index/

[ Want to contribute to PHP exercises? Send your code (attached with a .zip file) to us at w3resource[at]yahoo[dot]com. Please avoid copyrighted materials.]

List of Exercises with Solutions :



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