Php
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Basics
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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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- 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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- 3 Operators 5
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Aritmetic S
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- 4 Function 4
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Basics S
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- 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 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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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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App
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Http Foundation
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Resolver
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SoC
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Symfony v5
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Laravel v8
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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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Q
Php Basics Constants
Constants defined with const keyword Class constants, default as public define('A', 1); const A = 1; // Warning: already defined const B = 2; const C = array(3);
Constants
A constant can't be changed once set.
/**
* Constants can be defined using the const keyword ...
* or by using the define()
*
* Can't be changed once set.
* Can be accessed for any scope within a script.
*/
error_reporting(E_ALL);
define('A', '1');
// const A = 1; // Warning: Constant A already defined
const B = 2;
const C = array(3);
{
echo A; # 1
echo B; # 2
echo C[0]; # 3
}
Class
The default visibility of class constants is public.
/**
* Class constants are allocated once per class, ...
* and not for each class instance.
*/
class MyClass {
const A = 1;
private const B = 2;
public function __construct() {}
}
echo MyClass::A; // 1
➥ Questions