Php
/
OOP
- 1 Basics 5
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Quotes S
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Constants S
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Control structures S
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Reference S
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Number systems S
- 2 Variables 4
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Definition S
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Variable variable S
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Exists S
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Type casting S
- 3 Operators 5
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Aritmetic S
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Bitwise S
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String S
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Comparison S
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Logical S
- 4 Function 4
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Definition S
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Anonymous S
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Reference S
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Variable arguments S
- 5 Array 7
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Basics S
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Operations S
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Create S
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Search S
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Modify S
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Sort S
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Storage S
- 6 String 9
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Basics
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Compare
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Search
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Replace
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Format
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Regexp
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Parse
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Formating
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Json
- 7 Streams 6
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File open
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Read file
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Read csv
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File contents
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Context
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Ob_start
- 8 Oop 6
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Object instantiation S
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Class constructor
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Interfaces, abstract
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Resource visibility
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Class constants
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Namespaces
- 9 Features 9
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Autoload
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Class reflection
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Magic methods
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Exceptions S
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Late static binding
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Type hinting
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SPL
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PHPUNIT
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PHAR
- 10 Versions 2
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Php7.4 S
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Php8.0 S
- 11 Http 4
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Headers
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File Uploads
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Cookies
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Sessions
- 12 Design Patterns 4
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Singleton Pattern S
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Observer Pattern
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Strategy Pattern
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Registry
- 13 Modern Php 8
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Composer S
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Slim Framework
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Autoloader
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Package
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Releases
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Generators
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Dependency Injection
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Middleware
- 14 Create Framework 7
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App
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Http Foundation
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Front Controller
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Routing
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Render Controller
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Resolver
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SoC
- 15 Frameworks 4
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Symfony v5
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Laravel v8
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Laminas v3
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Codeigniter v4
- 16 Composer 5
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Guzzle
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Carbon
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Faker
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Math
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Requests
- 17 Symfony 6
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Routes S
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Annotations
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Flex
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Controllers
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Doctrine
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Templating
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R
Q
Php OOP Object Instantiation
A class is only a blueprint Before use, it must be instantiated $a = new A; echo $a->foo;Objects
Instantiation
A class is only a blueprint, it must be instantiated into object before use. For instantiation use new constructor keyword.
class myClass
{
// Class contents go here
}
$myClassInstance = new myClass();
Reference
An object is always passed by reference (different from others type of variables). For Object & are not needed.
code
class A
{
public $foo = 1;
}
$a = new A;
$b = $a; // both $a and $b will point to the same object
echo $a->foo; // 1
$a->foo = 2;
echo $b->foo; // 2 - Look Here
Reinstantiation
Object reinstantiation breaks the reference.
code
class myClass
{
public $foo;
public function __construct($val)
{
$this->foo = $val;
}
}
$a = new myClass(1);
$b = $a;
echo $a->foo; // 1
$a->foo = 2;
echo $b->foo; // 2
$a = new myClass(2); // Look Here
echo $a->foo; // 2
echo $b->foo; // 1 -> reference is broken
Inheritance
Class Inheritance allows a class to extend another class. Parent classes can be accessed using the special parent:: namespace.
code
class A
{
function test()
{
echo "A";
}
}
class B extends A
{
function test()
{
parent::test(); // A
echo "B";
}
}
$a = new A();
$b = new B();
$a->test(); // A
$b->test(); // AB
➥ Questions
Last update: 100 days ago