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PHP Advanced Introduction

PHP Advanced is a course for programs that need deeper control over classes, choices and data. Each lesson adds one advanced idea and proves it with small programs.

A class with a trait prints a line

The Logger trait holds one log method. The Page class takes the trait, and the page object runs the method.

<?php
trait Logger {
  public function log($message) {
    echo "Log: " . $message . "\n";
  }
}
class Page {
  use Logger;
}
$page = new Page();
$page->log("Page opened");

An interface-typed function prints a line

The Greeter interface names one greet method. The welcome function names Greeter as its parameter type, so the Host object fits the call.

<?php
interface Greeter {
  public function greet();
}
class Host implements Greeter {
  public function greet() {
    echo "Hello and welcome\n";
  }
}
function welcome(Greeter $greeter) {
  $greeter->greet();
}
welcome(new Host());

Example

<?php
class Product {
  public $name = "";
  public function show() {
    echo "Product: " . $this->name . "\n";
  }
}
$stock = ["Pen" => 4, "Notebook" => 12];
foreach ($stock as $name => $count) {
  $product = new Product();
  $product->name = $name;
  $product->show();
  if ($count >= 10) {
    echo "Stock: plenty\n";
  } else {
    echo "Stock: low\n";
  }
}

Key points

  • Match choices and fixed value sets come first in the course.
  • Class lessons add locked values, placed data and close inspection of classes.
  • Call lessons pass arguments in new ways and turn methods into values.
  • Later lessons pause work and resume it in small steps.
  • Type lessons show how values change form and how a strict mode can stop that change.
  • Error lessons sort errors into a family and catch each kind in its own way.
  • Data lessons use ready-made stacks, queues, heaps and walkers.
  • The last lessons look inside PHP at shared values and at how PHP runs faster on a server.

In this example, the stock array pairs each product name with a count. The foreach loop takes one pair at a time and makes a Product object for the name. The if check prints plenty for a count of 10 or more and low for a smaller count.

Try it Yourself

Edit the code, then press Run.

Running is simulated

Exercise

What does this course do with the skills from the earlier courses?