Php
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Function
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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 csv
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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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Definition
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Last update: 18-05-2022
Name
Function name is case-insensitive.
/**
* Function names are case-insensitive
*
* Having a function name() and adding a new one Name() ...
* throws a Fatal error: Cannot redeclare Name()
*/
function name() {
echo "1";
}
if (! function_exists('name')) {
function Name() {
echo "2";
}
}
Name(); // "1"
Return
Return is a language construct, parentheses are not required.
/**
* Return is not a function, it is a language construct.
* Parantheses are not required and ...
* it is commmont to leave them out.
*/
function A() {
return (1);
}
function B() {
return 2; // also, it is faster
}
echo A(); // Output: 1
echo B(); // Output: 2
Null
A function returns NULL, if you don't return a value.
// The concept of "void" functions does not really apply to PHP
function name() {}
echo (name() === NULL); // 1
➥ Questions github Function