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@ 2014-02-05T23:56:35Z

<?php

function number_factory($num) {
    return function($operation) use ($num)  {
        return $operation ? $operation($num) : $num;
    };
}

function operation_factory($operation) {
    return function($b) use ($operation) {
        return function($a) use ($b, $operation) {
            return $operation($a, $b);
        };
    };
}

$plus      = operation_factory(function($a, $b) { return $a+$b; });
$minus     = operation_factory(function($a, $b) { return $a-$b; });
$times     = operation_factory(function($a, $b) { return $a*$b; });
$dividedBy = operation_factory(function($a, $b) { return $a/$b; });

$zero  = number_factory(0);
$one   = number_factory(1);
$two   = number_factory(2);
$three = number_factory(3);
$four  = number_factory(4);
$five  = number_factory(5);
$six   = number_factory(6);
$seven = number_factory(7);
$eight = number_factory(8);
$nine  = number_factory(9);

print($two($plus($three($minus($two())))));

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Uncaught ArgumentCountError: Too few arguments to function {closure}(), 0 passed in /in/roWqQ on line 33 and exactly 1 expected in /in/roWqQ:4 Stack trace: #0 /in/roWqQ(33): {closure}() #1 {main} thrown in /in/roWqQ on line 4
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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