PHP · Theory

Constructor

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Theory

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Constructor

Constructor is a PHP idea you prove with class Student, not with a slogan.

For Constructor, a .php page is in play. Don’t blame it until you have traced class Student.

Without Constructor, a small OOP file gets messy and class Student is hard to trust.

Dev ships Constructor in a small OOP file. That is the use case worth saying.

If class Student breaks under Constructor, check public everything first.

Constructor is not a lonely heading. Dev ties it to class Student.

Viva for Constructor — what it is → new Student('Asha', 72) → the mistake (public everything).

Diagram

Exam tip

Board: class Student. Dry-run Constructor. Name the 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 — Dev uses it for class Student in a small OOP file.
RuleConstructor → new Student('Asha', 72).
RememberConstructor + a .php page (a small OOP file).
UseConstructor in a small OOP file (class Student).
TrapConstructor — public everything.
ExConstructor → class Student.

PHP · Theory

Constructor

← All stacks

Theory

56/352

Constructor

Constructor is a PHP idea you prove with class Student, not with a slogan.

For Constructor, a .php page is in play. Don’t blame it until you have traced class Student.

Without Constructor, a small OOP file gets messy and class Student is hard to trust.

Dev ships Constructor in a small OOP file. That is the use case worth saying.

If class Student breaks under Constructor, check public everything first.

Constructor is not a lonely heading. Dev ties it to class Student.

Viva for Constructor — what it is → new Student('Asha', 72) → the mistake (public everything).

Diagram

Exam tip

Board: class Student. Dry-run Constructor. Name the 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 — Dev uses it for class Student in a small OOP file.
RuleConstructor → new Student('Asha', 72).
RememberConstructor + a .php page (a small OOP file).
UseConstructor in a small OOP file (class Student).
TrapConstructor — public everything.
ExConstructor → class Student.

Constructor

Example

Short notes

Questions

Constructor

Example

Short notes

Questions