Php
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Function
- 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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Storage
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Basics
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Compare
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Search
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Replace
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Regexp
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Parse
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Formating
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Json
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File open
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Read file
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Read csv
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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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SPL
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PHPUNIT
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PHAR
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Php7.4
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Php8.0
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Singleton Pattern
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Observer Pattern
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Slim Framework
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Symfony v5
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Math
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- 17 Symfony 6
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Flex
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Doctrine
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Templating
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Function anonymous
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Last update: 20-02-2022
Closures
Allow the creation of functions which have no specified name. Also known as closures.
preg_match("/-([a-z])/", "Hello-world", $match);
echo $match[1]; // output w
echo preg_replace_callback('/-([a-z])/', function($match) {
return " " . strtoupper($match[1]);
}, 'Hello-world'); // outputs: Hello World
Declaration
Be aware of the ; after function declaration. Without it, the following code will output a Notice (Parse error syntax)
$a = function($var) {
$b = "Hello $var";
return $b;
}; // ; at the end
echo $a('World'); // outputs: Hello World
Callbacks
Anonymous functions are useful when using callback functions. Functions like array_filter or array_map do:
$data = array(0, 3, 10);
$data = array_filter ($data, function($x) {
return $x % 2 == 0; // even
});
var_dump($data); // 0 => 0 / 2 => 10
$data = array(0, 3, 10);
$data = array_map(function ($x) {
return $x*$x;
}, $data); // square
var_dump($data); // [0, 9, 100]
➥ Questions