Online PHP editor | rfc for L7ft1

@ 2023-11-27T08:29:39Z

<?php

function getCoins(int $totalAmount, $denominations = [2 ,5, 10]){
    $amtPossible = [];
    foreach($denominations as $d){
        $amtPossible[ $d ]= [1, $d];
        for($i = $d + 1; $i <= $totalAmount; ++$i){
            if(isset($amtPossible[ $i - $d ])){
                if(!isset($amtPossible[ $i ]) || $amtPossible[ $i ][0] > 1 + $amtPossible[ $i - $d ][0]){
                    $amtPossible[ $i ][0] = 1 + $amtPossible[ $i - $d ][0];
                    $amtPossible[ $i ][1] = $d;
                }
            }
        }
    }
    
    if(!isset($amtPossible[ $totalAmount ])){
        throw new \Exception("$totalAmount is not possible with the denominations ". implode(",", $denominations));
    }
    
    $coins = [];
    while($totalAmount > 0){
        $coins[] = $amtPossible[ $totalAmount ][1];
        $totalAmount -= $amtPossible[ $totalAmount ][1];
    }
    
    return $coins;
}

foreach([10, 11, 21, 23, 31, 3] as $test){
    try{
        echo $test, " => ", implode(", ", getCoins($test)), PHP_EOL;
    }catch(\Exception $e){
        echo $e->getMessage(), PHP_EOL;
    }
}

Output for git.master_jit, git.master, rfc.property-hooks: 10 => 10 11 => 5, 2, 2, 2 21 => 10, 5, 2, 2, 2 23 => 10, 5, 2, 2, 2, 2 31 => 10, 10, 5, 2, 2, 2 3 => 3 is not possible with the denominations 2,5,10

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
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2015-02-14 Union Types - declined
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