PHP (id, name, variants) 的笛卡尔积

Question

你能帮我生成 caresian 产品吗？它类似于 this Whosebug。我想生成输入，所以我需要保留 ID。

示例：

我的输入数据：

[
  1 => [
    id => 1,
    name => "Color",
    options => [
       5 => [
         id => 5,
         name => "Red"
       ],
       6 => [
         id => 6,
         name => "Blue"
       ]
    ]
  ],
 2 => [
    id => 2,
    name => "Size",
    options => [
       7 => [
         id => 7,
         name => "S"
       ],
       8 => [
         id => 8,
         name => "M"
       ]
    ]
  ],

  // etc
]

我期望的结果：

[
 "5-7" => "Red / S",
 "5-8" => "Red / M",
 "6-7" => "Blue / S",
 "6-8" => "Blue / M"
]

我需要任意数量的通用函数 properties/options..

Answer 1

嵌套循环人，数组 1 的每个条目都必须与数组 2 的每个条目链接。

$finalArray = array();

foreach (array1 as $key1 as $value1){
  foreach (array2 as $key2 as$value2){
   echo  $value1 . " - " .$value2."<br/>";
   $finalArray[$key1.'-'.$key2] =   $value1 ." - ".$value2;
 }
}

finalArray 将满足您的需求。

Answer 2

这实际上是目前有效的代码，但不知道效率如何。

// filter out properties without options
$withOptions = array_filter($properties, function($property) {
    return count($property['options']) > 0;
});

$result = [];

$skipFirst = true;

foreach ($withOptions as $property) {

    if ($skipFirst) {

        foreach (reset($withOptions)['options'] as $id => $option) {
            $result[$id] = $option['name'];
        }

        $skipFirst = false;
        continue;
    }

    foreach ($result as $code => $variant) {    
        foreach ($property['options'] as $id => $option) {
            $new = $code . "-" . $id;
            $result[$new] = $variant . " / " . $option['name'];
            unset($result[$code]);
        }
    }
}

PHP (id, name, variants) 的笛卡尔积

cartesian product with PHP (id, name, variants)

php

associative-array

cartesian-product