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@ 2016-10-05T13:24:35Z

<?php

    $arr = array(
        array('optional' => 0, 2, 9),
        array('optional' => 0, 3, 4),/*
        array('optional' => 0, 6, 7, 8),*/
        array('optional' => 1, 6,),/*
        array('optional' => 1, 6, 7, 8, 5, 9),
        array('optional' => 1, 6, 7, 8, 10, 11, 12)*/
    );
    
    
    function generateCombinations(array $array) {
        foreach (array_pop($array) as $value) {
            $option = $value["optional"];
            if (count($array)) {
                foreach (generateCombinations($array) as $combination) {
                    yield array_merge([$value], $combination);
                };
            } else {
                yield [$value];
                if($option == 1)
                    yield [];
            }
        }
    }
    
    
    foreach(generateCombinations($arr) as $combination){
        echo implode(",", $combiantion) . "\n";
    }

Output for git.master, git.master_jit: Warning: Trying to access array offset on value of type int in /in/gNBsJ on line 15 Warning: Trying to access array offset on value of type int in /in/gNBsJ on line 15 Warning: Trying to access array offset on value of type int in /in/gNBsJ on line 15 Warning: Undefined variable $combiantion in /in/gNBsJ on line 30 Fatal error: Uncaught TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in /in/gNBsJ:30 Stack trace: #0 /in/gNBsJ(30): implode(',', NULL) #1 {main} thrown in /in/gNBsJ on line 30
Process exited with code 255.
Output for rfc.property-hooks: Warning: Trying to access array offset on int in /in/gNBsJ on line 15 Warning: Trying to access array offset on int in /in/gNBsJ on line 15 Warning: Trying to access array offset on int in /in/gNBsJ on line 15 Warning: Undefined variable $combiantion in /in/gNBsJ on line 30 Fatal error: Uncaught TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in /in/gNBsJ:30 Stack trace: #0 /in/gNBsJ(30): implode(',', NULL) #1 {main} thrown in /in/gNBsJ on line 30
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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