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@ 2015-03-16T13:01:51Z

<?php

    function createAttributeCollections($pricingAttributes = null, $permutation = array()){
        //permutation result
        if (empty($pricingAttributes)) {
            echo implode(',', $permutation ).'<br>';
        //permutation
        }  else {
            //permutation loop
            for ($i = count($pricingAttributes) - 1; $i >= 0; --$i) {
                $newpricingAttributes = $pricingAttributes;
                $newPermutations = $permutation;
                list($foo) = array_splice($newpricingAttributes, $i, 1);
                array_unshift($newPermutations, $foo);
                createAttributeCollections($newpricingAttributes, $newPermutations);
            }
        }
    }
    
    
    $results = createAttributeCollections(array('A','B','G','U'));

Output for git.master, git.master_jit, rfc.property-hooks: A,B,G,U<br>B,A,G,U<br>A,G,B,U<br>G,A,B,U<br>B,G,A,U<br>G,B,A,U<br>A,B,U,G<br>B,A,U,G<br>A,U,B,G<br>U,A,B,G<br>B,U,A,G<br>U,B,A,G<br>A,G,U,B<br>G,A,U,B<br>A,U,G,B<br>U,A,G,B<br>G,U,A,B<br>U,G,A,B<br>B,G,U,A<br>G,B,U,A<br>B,U,G,A<br>U,B,G,A<br>G,U,B,A<br>U,G,B,A<br>

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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