Online PHP editor | rfc for u5pBK

@ 2018-04-21T03:07:58Z

<?php

$colors = array ('red','blue','green','yellow');

$boxes = array ('circular','squared','hexagonal','triangular');

$possible_combos = array
(
    array('circular','red','blue'),
    array('squared','red','green'),
    array('hexagonal','blue','yellow'),
    array('triangular','red','green')
);

// collect constraints ordered by rarest
foreach ($possible_combos as $constraint) {
    $box = array_shift($constraint);
    foreach ($constraint as $color) {
        $constraints[$color] []= $box;
    }
}

// assign rarest first to last
asort($constraints);
foreach ($constraints as $color => $allowedBoxes) {
    foreach ($allowedBoxes as $box) {
        $key = array_search($box, $boxes);
        // if we have a match, then remove it from the collection
        if ($key !== false) {
            $result[$box] = $color;
            unset($boxes[$key]);
            continue 2;
        }
    }
}

print_r($result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [hexagonal] => yellow [circular] => blue [squared] => green [triangular] => red )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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