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
R
Q
Contruct
Php uses the magic __construct() method as constructor. Constructor is usefull for initializing object's properties.
code
class A
{
function __construct()
{
echo __METHOD__;
}
}
$obj = new A(); // A::__construct
Destruct
You can unset() or overwrite a variable that is reference for an object. The object itself may not be destroyed. The reference to it is held elsewhere.
code
class A
{
function __construct() {}
function foo()
{
echo "A is alive";
}
}
$a = new A();
echo $a->foo(); // A is alive
$b = $a;
unset($a);
echo $a->foo(); // Fatal error: ... non-object
echo $b->foo(); // A is alive
The __destruct() method is called at the end of script execution.
code
class A
{
function __construct()
{
echo "A is alive";
}
function __destruct()
{
echo "A is dead";
}
}
$a = new A(); // A is alive / A is dead
➥ Questions