React\Promise\settle()

settle.php

<?php

namespace React\Promise;

function settle($promisesOrValues)
{
    return resolve($promisesOrValues)
        ->then(function ($array) {
            if (!is_array($array) || !$array) {
                return resolve([]);
            }

            return new Promise(function ($resolve, $reject, $progress) use ($array) {
                $toResolve = count($array);
                $values    = [];

                $toFulfilledState = function ($x) {
                    return ['state' => 'fulfilled', 'value' => $x];
                };
                
                $toRejectedState = function ($x) {
                    return ['state' => 'rejected', 'reason' => $x];
                };

                foreach ($array as $i => $promiseOrValue) {
                    resolve($promiseOrValue)
                        ->then($toFulfilledState, $toRejectedState)
                        ->then(
                            function ($mapped) use ($i, &$values, &$toResolve, $resolve) {
                                $values[$i] = $mapped;

                                if (0 === --$toResolve) {
                                    $resolve($values);
                                }
                            },
                            $reject,
                            $progress
                        );
                }
            });
        });
}