Php
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Array
- 1 Basics 5
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Quotes
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Constants
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Control structures
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Reference
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Integers
- 2 Variables 4
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Definition
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Naming
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Exists
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Type casting
- 3 Operators 5
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Aritmetic
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Bitwise
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String
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Comparison
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Logical
- 4 Function 4
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Definition
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Anonymous
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Reference
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Variable scope
- 5 Array 9
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Basics
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Operations
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Create
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KeyValue
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Search
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Modify
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Sort
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Stacks
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Storage
- 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
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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
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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
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Php8.0
- 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
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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
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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
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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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Array basics
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Last update: 29-10-2021
Arrays
Convertion
PHP automaticaly converts an unitialized array.
$x[] = 0;
$x['aa'] = 11;
var_dump($x); // array(2) { [0]=> int(0) ["aa"]=> int(11) }
Echo don't display value type, and can't be used with arrays and object.
$x = 1;
echo $x; // output 1
var_dump($x); // output int(1)
Keys
You can add an element to an array without specifying a key. PHP assigns a number > the greatest key.
$a = array (2 => 5);
$a[] = 'a'; // This will have a key of 3
This is true even if the array contains a mix of numerical and string keys.
$a = array ('4' => 5, 'a' => 'b');
$a[] = 44; // This will have a key of 5
Array keys are case-sensitive, but type insensitive.
$a = array (
'A' => 1,
'a' => 2,
'1' => 3,
1 => 4,
'01' => 5, // Only '1' is eq with 1
);
var_dump($a); // [A=>1, a=>2, 1=>3, 01=>5]
List
List constructor assign array's values to individual variables.
list($surname, $name, $age) =
["John", "Smith", "34", "07288333"];
echo "$surname $name is $age years old";
// Ouput: John Smith is 34 years old
List is very usefull for string explode.
$date = '25/05/2012';
list($day, $month, $year) = explode('/', $date);
echo $month; // 05
➥ Questions