Things you should know about PHP

An introduction to PHP, presented to the Swansea Software Development Community (SSDC) and PHP South West.

Transcript

1. Things to know about PHP Oliver Davies (@opdavies) https://oliverdavies.uk/things-about-php
2. @opdavies
3. elePHPants! @opdavies
4. What is PHP? PHP is a popular general-purpose scripting language that is especially suited to web development. Fast, flexible and pragmatic, PHP powers everything from your blog to the most popular websites in the world. http://php.net @opdavies
5. Personal Home Page @opdavies
6. PHP: Hypertext Preprocessor (recursive acronym) @opdavies
7. @opdavies
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10. How do I get started? @opdavies
11. php -v @opdavies
12. PHP 8.1.0 (cli) (built: Nov 30 2021 07:15:23) (NTS) Copyright (c) The PHP Group Zend Engine v4.1.0, Copyright (c) Zend Technologies @opdavies
13. vim index.php @opdavies
14. Your first PHP file 1 <?php 2 3 // index.php @opdavies
15. Your first PHP file 1 <?php 2 3 // index.php 4 5 echo 'Hello World'; @opdavies
16. php index.php @opdavies
17. php -S localhost:8000 @opdavies
18. /app # php -S localhost:8000 [Tue Mar 8 20:52:39 2022] PHP 8.1.0 Development Server (http://localhost:8000) started @opdavies
19. @opdavies
20. docker run --rm -v $PWD:/app -w /app php:8.1-cli-alpine php index.php @opdavies
21. docker run --rm -v $PWD:/app -w /app php:7.4-cli-alpine php index.php @opdavies
22. docker run --rm -v $PWD:/var/www/html -p 80:80 php:8.1-apache @opdavies
23. 1 <?php 2 3 // index.php 4 5 function say() 6 { 7 echo 'Hello!'; 8 } @opdavies
24. 1 <?php 2 3 // index.php 4 5 function say($value) 6 { 7 echo $value; 8 } @opdavies
25. 1 <?php 2 3 // index.php 4 5 function say(string $value): void 6 { 7 echo $value; 8 } @opdavies
26. 1 <?php 2 3 // index.php 4 5 function say(string $value): string 6 { 7 return $value; 8 } @opdavies
27. 1 <?php 2 3 // src/Person.php 4 5 class Person 6 { 7 public function say(string $value): void 8 { 9 echo $value; 10 } 11 } @opdavies
28. 1 <?php 2 3 // Version 1. 4 say(); @opdavies
29. 1 <?php 2 3 // Version 1. 4 say(); 5 6 // Version 2. 7 say('something'); @opdavies
30. 1 <?php 2 3 // Version 1. 4 say(); 5 6 // Version 2. 7 say('something'); 8 9 // Version 3. 10 $person = new Person(); 11 $person->say('something'); @opdavies
31. Levelling Up Content Management Systems @opdavies
32. These lists are not exhaustive @opdavies
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38. Levelling Up Frameworks @opdavies
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42. But I only need a static site Static site generators @opdavies
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45. Code reuse and collaboration @opdavies
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50. composer require symfony/console @opdavies
51. { "require": { "symfony/console": "^4.2" } } @opdavies
52. 1 <?php 2 3 require 'vendor/autoload.php'; @opdavies
53. 1 <?php 2 3 require 'vendor/autoload.php'; 4 5 $app = new \Symfony\Component\Console\Application(); 6 $app->run(); @opdavies
54. 1 <?php 2 3 require 'vendor/autoload.php'; 4 5 use Symfony\Component\Console\Application; 6 7 $app = new Application(); 8 $app->run(); @opdavies
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57. Tools @opdavies
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63. 1 <?php 2 3 // PHPUnit. 4 5 use App\Email; 6 7 final class EmailTest extends TestCase 8 { 9 public function testCanBeCreatedFromValidEmailAddress(): void 10 { 11 $this->assertInstanceOf( 12 Email::class, 13 Email::fromString('user@example.com') 14 ); 15 } 16 } @opdavies
64. 1 <?php 2 3 // Pest. 4 5 use App\Email; 6 7 it('can be created from a valid email address', function () { 8 expect(Email::fromString('user@example.com')) 9 ->toBeInstanceOf(Email::class); 10 }); @opdavies
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66. Feature: ls In order to see the directory structure As a UNIX user I need to be able to list the current directory's contents Scenario: List 2 files in a directory Given I am in a directory "test" And I have a file named "foo" And I have a file named "bar" When I run "ls" Then I should get: """ bar foo """ @opdavies
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68. Learning @opdavies
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76. The Community @opdavies
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80. Things you should know about PHP • Very easy to get started • A large choice of tools and frameworks • A great worldwide community • Great learning resources • Gain experience by contributing to open source projects @opdavies
81. Thanks! References: • https://www.oliverdavies.uk/things-about-php Me: • https://www.oliverdavies.uk @opdavies