Things you should know about PHP

Things to know about
PHP
Oliver Davies (@opdavies)
https://oliverdavies.uk/things-about-php

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elePHPants!
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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
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Personal Home Page
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PHP: Hypertext Preprocessor
(recursive acronym)
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How do I get started?
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php -v
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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
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vim index.php
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Your first PHP file
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3 // index.php
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Your first PHP file
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3 // index.php
4
5 echo 'Hello World';
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php index.php
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php -S localhost:8000
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/app # php -S localhost:8000
[Tue Mar 8 20:52:39 2022] PHP 8.1.0 Development Server
(http://localhost:8000) started
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docker run --rm -v $PWD:/app
-w /app php:8.1-cli-alpine
php index.php
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docker run --rm -v $PWD:/app
-w /app php:7.4-cli-alpine
php index.php
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docker run --rm
-v $PWD:/var/www/html -p 80:80
php:8.1-apache
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1 2
3 // index.php
4
5 function say()
6 {
7 echo 'Hello!';
8 }
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1 2
3 // index.php
4
5 function say($value)
6 {
7 echo $value;
8 }
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1 2
3 // index.php
4
5 function say(string $value): void
6 {
7 echo $value;
8 }
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1 2
3 // index.php
4
5 function say(string $value): string
6 {
7 return $value;
8 }
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1 2
3 // src/Person.php
4
5 class Person
6 {
7 public function say(string $value): void
8 {
9 echo $value;
10 }
11 }
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1 2
3 // Version 1.
4 say();
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1 2
3 // Version 1.
4 say();
5
6 // Version 2.
7 say('something');
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1 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');
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Levelling Up
Content Management Systems
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These lists are not exhaustive
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Levelling Up
Frameworks
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But I only need a static site
Static site generators
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Code reuse and collaboration
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composer require
symfony/console
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{
"require": {
"symfony/console": "^4.2"
}
}
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1 2
3 require 'vendor/autoload.php';
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4
5 $app = new \Symfony\Component\Console\Application();
6 $app->run();
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4
5 use Symfony\Component\Console\Application;
6
7 $app = new Application();
8 $app->run();
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Tools
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1 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('[email protected]')
14 );
15 }
16 }
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1 2
3 // Pest.
4
5 use App\Email;
6
7 it('can be created from a valid email address', function () {
8 expect(Email::fromString('[email protected]'))
9 ->toBeInstanceOf(Email::class);
10 });
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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
"""
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Learning
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The Community
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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
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Thanks!
References:
• https://www.oliverdavies.uk/things-about-php
Me:
• https://www.oliverdavies.uk
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Things you should know about PHP

Things you should know about PHP

Oliver Davies

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