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@ 2019-11-07T15:20:43Z

<?php

$data = [
    ['alteration1', 'alteration4',],
    ['alteration2','alteration3'],
    ['alteration2','alteration3'],
    []
];


$combinations = [[]];

foreach($data as $index => $current_data){
   $current_data = array_unique($current_data);  
   if(empty($current_data)) continue;
   $temp_combinations = [];
   foreach($current_data as $value){
       foreach($combinations as $each_combination){
           $temp_combinations[] = array_merge($each_combination,[$value]);
       }
   }
   
   $combinations = $temp_combinations;
   
}

$set = [];
$unique_combinations = [];

foreach($combinations as $each_combination){
    natsort($each_combination);
    $serialized_form = implode(",",$each_combination);
    if(isset($set[$serialized_form])) continue;
    if(empty($each_combination)) continue;
    $unique_combinations[] = $each_combination;
    $set[$serialized_form] = true;
}

print_r($unique_combinations);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => Array ( [0] => alteration1 [1] => alteration2 [2] => alteration2 ) [1] => Array ( [1] => alteration2 [2] => alteration2 [0] => alteration4 ) [2] => Array ( [0] => alteration1 [2] => alteration2 [1] => alteration3 ) [3] => Array ( [2] => alteration2 [1] => alteration3 [0] => alteration4 ) [4] => Array ( [0] => alteration1 [1] => alteration3 [2] => alteration3 ) [5] => Array ( [1] => alteration3 [2] => alteration3 [0] => alteration4 ) )

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Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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