PHP · Theory

Classes and Objects

Theory

55/352

Classes and Objects

class Student { public $name; function __construct($name) { $this->name = $name; } } $s = new Student('Asha'); Object is one student. Class is the blueprint. $this is that object.

public/private/protected control who can touch fields. Keep fields private when you can.

Trap — $s.method() like JS. PHP is $s->method(). Trap: forgetting new.

Exam tip

new Student('Asha'); $s->name $this inside the class.

Example

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

Classes and Objects — constructor property promotion keeps simple classes short.

Short notes

DefClass = blueprint. Object = new Student.
Rule$this and -> not .
TrapDot instead of ->.

PHP · Theory

Classes and Objects

← All stacks

Theory

55/352

Classes and Objects

class Student { public $name; function __construct($name) { $this->name = $name; } } $s = new Student('Asha'); Object is one student. Class is the blueprint. $this is that object.

public/private/protected control who can touch fields. Keep fields private when you can.

Trap — $s.method() like JS. PHP is $s->method(). Trap: forgetting new.

Exam tip

new Student('Asha'); $s->name $this inside the class.

Example

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

Classes and Objects — constructor property promotion keeps simple classes short.

Short notes

DefClass = blueprint. Object = new Student.
Rule$this and -> not .
TrapDot instead of ->.

Classes and Objects

Example

Short notes

Questions

Classes and Objects

Example

Short notes

Questions