2018 05-11 the way we teach tech - phpday

PHPDay 11-05-2018
The way we teach tech Jeroen van der Gulik

About me
❖ Software Architect/ Consultant
❖ Co-Founder Isset
(https://isset.nl)
❖ Señor Developer
❖ Organizer DDDNL
❖ Builder of Artiﬁcial Stupidity
❖ @n0x13

<html>
<head>
<title>My first project</title>
</head>
<body>
<?php echo '<p>Hello World<p>'; ?>
</body>
</html>

Parse error: syntax error, unexpected
'echo' (T_ECHO), expecting ',' or ‘;'
in hello_world.php on line 6

Stages of Problem Solving
❖ I just want to solve my problem
❖ I want to understand my problem
❖ I want to be pointed into the right direction and given
options

Context depends on
❖ Knowledge
❖ Experience
❖ Time
❖ Pressure
❖ Interest

No Knowledge
Some
Knowledge
Knowledgable
Just solve my problem √
Understand my problem √
I want options √

final class Example
{
public function doSomething()
{
$this->doAThingThatSometimesFails();
}
}

– John Doe (Jr. Developer)
“I want to log errors”

– Sansa Stark (Sr. Developer)
“Great ! Have you thought about ELK,
Syslog, Splunk or Kafka ?”

final class Example
{
{
try {
} catch (Throwable $throwable) {
file_put_contents(
realpath('var/log/my.log'),
$throwable->getMessage() . PHP_EOL,
FILE_APPEND
);
}
}
}

– Alice Wonderland (Code Reviewer)
“What if we want to
change the location?”

“Ok much better !
But global variables are
tricky…”

“What if we want to log to
something else than ﬁle?”

interface Logger
{
public function log($message);
}

final class FileLogger implements Logger
{
private $pathToLogFile;
public function __construct(string $pathToLogFile)
{
$this->pathToLogFile = $pathToLogFile;
}
public function log($message)
{
file_put_contents(
realpath($this->pathToLogFile),
$message,
FILE_APPEND
);
}
}

final class Example
{
private $logger;
public function __construct(Logger $logger)
{
$this->logger = $logger;
}
{
try {
$this->logger->log($throwable->getMessage());
}
}
}

“Did you know there was a
standard for this?”

“Do you know about
decorators?”

interface DoSomething
{
public function doSomething();
}

final class LoggableExample implements DoSomething
{
private $example;
private $logger;
public function __construct(Example $example, LoggerInterface $logger)
{
$this->example = $example;
$this->logger = $logger;
}
{
try {
$this->example->doSomething();
$this->logger->error($throwable->getMessage());
}
}
}

final class Example implements DoSomething
{
{
}
}

We explained
❖ Why global variable (state) is bad
❖ Why Dependancy Injection is good
❖ Why Interfaces are good
❖ Why Single Responsibility is good
❖ Why Decorator is useful (sometimes)

Learning or Teaching opportunities

– Robert Martin a.k.a. Uncle Bob
“The number of programmers doubles
every 5 years. That means, at any time,
half the world's programmers have less
than 5 yrs experience”

The way we should teach tech
❖ People learn best 1 step at the time
❖ Find opportunities to learn or teach
❖ Find mentors/mentees
❖ Create your own Seniors
❖ Never stop learning

Feedback
❖ https://joind.in/talk/d51ab

2018 05-11 the way we teach tech - phpday

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