PHP · Theory

Constructor

Theory

56/352

Constructor

Constructor is a PHP topic. In plain words you use it for class Student in a small OOP file. Don’t start with a slogan — start with that picture.

Smallest example: new Student('Asha', 72). Type it, run it, and say what you see. If you can do that from memory, you know Constructor.

From the example next to this theory — Constructor property promotion keeps simple classes short.

Trap — public everything. Fix that before you talk about advanced PHP.

Viva — what is Constructor? Then show new Student('Asha', 72). Then name the trap.

Diagram

Exam tip

What is Constructor? Show this: new Student('Asha', 72). Trap: public everything.

Example

<?php
class User {
  public function __construct(private string $name) {}
  public function hello(): string {
    return "Hello, {$this->name}";
  }
}
echo (new User("Ravi"))->hello();

Constructor property promotion keeps simple classes short.

Short notes

DefConstructor — class Student in a small OOP file.
Rulenew Student('Asha', 72)
Trappublic everything
Usea small OOP file

PHP · Theory

Constructor

← All stacks

Theory

56/352

Constructor

Constructor is a PHP topic. In plain words you use it for class Student in a small OOP file. Don’t start with a slogan — start with that picture.

Smallest example: new Student('Asha', 72). Type it, run it, and say what you see. If you can do that from memory, you know Constructor.

From the example next to this theory — Constructor property promotion keeps simple classes short.

Trap — public everything. Fix that before you talk about advanced PHP.

Viva — what is Constructor? Then show new Student('Asha', 72). Then name the trap.

Diagram

Exam tip

What is Constructor? Show this: new Student('Asha', 72). Trap: public everything.

Example

<?php
class User {
  public function __construct(private string $name) {}
  public function hello(): string {
    return "Hello, {$this->name}";
  }
}
echo (new User("Ravi"))->hello();

Constructor property promotion keeps simple classes short.

Short notes

DefConstructor — class Student in a small OOP file.
Rulenew Student('Asha', 72)
Trappublic everything
Usea small OOP file

Constructor

Example

Short notes

Questions

Constructor

Example

Short notes

Questions