PHP拼合陣列與變化輸出

Question

Array 
(
    [Colour] => Array 
     (
      [Red] => Red 
      [Blue] => Blue 
     ) 

    [Size] => Array 
     (
      [Small] => Small 
      [Medium] => Medium 
      [Large] => Large 
     ) 

    [Brand] => Array 
     (
      [Nike] => Nike 
      [Adidas] => Adidas 
     ) 

) 

如何獲得多維度陣列來獲得這種變化的輸出：

Red - Small - Nike 
Red - Medium - Nike 
Red - Large - Nike 
Red - Small - Adidas 
Red - Medium - Adidas 
Red - Large - Adidas 
Blue - Small - Nike 
Blue - Medium - Nike 
Blue - Large - Nike 
Blue - Small - Adidas 
Blue - Medium - Adidas 
Blue - Large - Adidas 

Answer 1

你所尋找的是一個笛卡爾積。

合併值是這樣的：

$data = [ 
    'Colour' => [ 
     'Red' => 'Red', 
     'Blue' => 'Blue', 
    ], 
    'Size' => [ 
     'Small' => 'Small', 
     'Medium' => 'Medium', 
     'Large' => 'Large', 
    ], 
    'Brand' => [ 
     'Nike' => 'Nike', 
     'Adidas' => 'Adidas', 
    ], 
]; 

$combined = []; 

foreach ($data['Colour'] as $colour) { 
    foreach ($data['Brand'] as $brand) { 
     foreach ($data['Size'] as $size) { 
      $combined[] = implode(' - ', [ 
       $colour, 
       $size, 
       $brand 
      ]); 
     } 
    } 
} 

var_dump($combined); 

爲了參考，見：

• https://en.wikipedia.org/wiki/Cartesian_product

有關示例，請參見：

• https://3v4l.org/6dpQY