Как распарсить массив?

Question

[voldant]

Как получить из массива:

$a = [
'color' => ['red', 'blue'],
'size' => ['10-12', '12-14']
];

такой массив

$b = [
['color' => 'red', 'size' => '10-12'],
['color' => 'blue', 'size' => '10-12'],
['color' => 'red', 'size' => '12-14'],
['color' => 'blue', 'size' => '12-14'],
];

ключей и значений может быть любое кол-во, имена ключей и значений могут быть разные

Comments

[voldant]

Нашел такое решение:

function cartesian($input) {
    $result = array();

    while (list($key, $values) = each($input)) {
        // If a sub-array is empty, it doesn't affect the cartesian product
        if (empty($values)) {
            continue;
        }

        // Seeding the product array with the values from the first sub-array
        if (empty($result)) {
            foreach($values as $value) {
                $result[] = array($key => $value);
            }
        }
        else {
            // Second and subsequent input sub-arrays work like this:
            //   1. In each existing array inside $product, add an item with
            //      key == $key and value == first item in input sub-array
            //   2. Then, for each remaining item in current input sub-array,
            //      add a copy of each existing array inside $product with
            //      key == $key and value == first item of input sub-array

            // Store all items to be added to $product here; adding them
            // inside the foreach will result in an infinite loop
            $append = array();

            foreach($result as &$product) {
                // Do step 1 above. array_shift is not the most efficient, but
                // it allows us to iterate over the rest of the items with a
                // simple foreach, making the code short and easy to read.
                $product[$key] = array_shift($values);

                // $product is by reference (that's why the key we added above
                // will appear in the end result), so make a copy of it here
                $copy = $product;

                // Do step 2 above.
                foreach($values as $item) {
                    $copy[$key] = $item;
                    $append[] = $copy;
                }

                // Undo the side effecst of array_shift
                array_unshift($values, $product[$key]);
            }

            // Out of the foreach, we can add to $results now
            $result = array_merge($result, $append);
        }
    }

    return $result;
}

Answer 1

[Андрей]

<?php
$a = [
'color' => ['red', 'blue', 'orange'],
'size' => ['10-12', '12-14', '13-13'],
'somekey' => ['val1', 'val2', 'val3'],
];

function addValue(&$arr, $key, $val)
{
	if (!count($arr)) {
		$arr[] = [$key => $val];
		return;
	}
	foreach($arr as $num => $values) {
		$arr[$num][$key] = $val;	
	}
	
}

$b = [];

foreach($a as $key => $values) {
	
	$copyB = $b;
	$newB = [];
	foreach($values as $value) {
		$currentB = $copyB;
		addValue($currentB, $key, $value);
		$newB = array_merge($newB, $currentB);
	}
	$b = $newB;
	
}

print_r($b);

Comments

[voldant]

Решение верное, но как-то все сложно

[Андрей]

voldant, сложная задача - сложное решение

[Егор]

Андрей, просто мышление сложное

Answer 2

[Александр]

function crossJoin($array)
{
    $result     = [];
    $current    = array_splice($array, -1);

    foreach ($current as $key => $values) {
        foreach ((array) $values as $value) {
            if (empty($array)) {
                array_push($result, [$key => $value]);
            } else {
                foreach (crossJoin($array) as $temp) {
                    array_push($result, array_merge([$key => $value], $temp));
                }
            }
        }
    }

    return $result;
}

crossJoin($a);

Comments

[voldant]

отлично

Answer 3

[Максим Тимофеев]

$b = [];
foreach($a['color'] as $color){
   foreach($a['size'] as $size){
      $b[] = ['color'=>$color,'size'=>$size];
   }
}
print_r($b);

Comments

[voldant]

Ключи могут быть любые, не только color и size, и их может быть больше 2х

[Максим Тимофеев]

oooportal.ru/?cat=article&id=684

[voldant]

в статье только про одномерные массивы

[Максим Тимофеев]

voldant, Вы хотите, а какая разница?

$keys = array_keys($a); //и вот у Вас одномерный массив

Answer 4

[Егор]

$b = [];
foreach ($a as $key => $values) {
  $i = 0;
  while($values){
    $b[$i][$key] = array_pop($values);
    $i++;
  }
}

var_dump($b);

Comments

[voldant]

у вас не перекрестных значений