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@ 2020-03-05T09:44:40Z

<?php
# Arrow Functions 2.0 `Short Closures`

# OLD WAY (PHP < 7.4 )
function cube($arg){
	return ($arg * $arg * $arg);
}

$b = array_map('cube', range(1, 5));
var_dump('Short closure old syntax', $b);

# OR
$b = array_map(function($a2) {return ($a2 * $a2 * $a2);}, range(1, 5));
var_dump('Short closure old syntax variant', $b);

# ONLY FOR PHP 7.4 +
#/!\ MORE CLEAR PHP CODE BEST PRACTIVE /!\
$b = array_map(fn($n) => $n * $n * $n, range(1, 5));
var_dump('Arrow Function 7.4 + syntax', $b);

# OLD Example with closure herit in parent scope with `use` syntax
$factor = 10;
$oldcalc = function(int $num) use ($factor): int {
	return $num * $factor;
};
var_dump('Short closure old syntax', $oldcalc(2));

# PHP 7.4 + syntax it allows us to build more readable and maintainable code.
$oldcalc = fn(int $num): int => $num * $factor;
var_dump('Arrow Function 7.4 + syntax', $oldcalc(2));

Output for git.master, git.master_jit, rfc.property-hooks: string(24) "Short closure old syntax" array(5) { [0]=> int(1) [1]=> int(8) [2]=> int(27) [3]=> int(64) [4]=> int(125) } string(32) "Short closure old syntax variant" array(5) { [0]=> int(1) [1]=> int(8) [2]=> int(27) [3]=> int(64) [4]=> int(125) } string(27) "Arrow Function 7.4 + syntax" array(5) { [0]=> int(1) [1]=> int(8) [2]=> int(27) [3]=> int(64) [4]=> int(125) } string(24) "Short closure old syntax" int(20) string(27) "Arrow Function 7.4 + syntax" int(20)

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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