从MySQL建立一个多维数组与php

Question

我想从一个MySQL结果集中形成一个特定的多维数组。

我想它看起来就像这样：

array(
'product_name' => 'prod_1', 
'categories' => array(1,2,3,4) 
); 

的分贝结果返回一个数组，看起来像这样

Array 
(
[0] => Array 
    (
     [id] => 1 
     [product_name] => prod_1 
    ) 

[1] => Array 
    (
     [id] => 2 
     [product_name] => prod_1 
    ) 

[2] => Array 
    (
     [id] => 3 
     [product_name] => prod_1 
    ) 

[3] => Array 
    (
     [id] => 4 
     [product_name] => prod_1 
    ) 

正如你可以看到，我想组产品名称并将其放入另一个阵列中

有没有人有关于如何操作的提示？

Answer 1

$yourarray = array(array('id'=>1, 'product_name' => 'prod_1'), array('id'=>2, 'product_name' => 'prod_2'),array('id'=>3, 'product_name' => 'prod_3')); 
$multiarray = array(); 

for($i=0; $i<count($yourarray);$i++){ 
    $multiarray['product_name'][] = $yourarray[$i]['product_name']; 
    $multiarray['product_id'][] = $yourarray[$i]['id']; 
} 

print_r($yourarray); //original array 
print_r($multiarray); //gives you multi array 

这是什么类似的东西？

您的原始数组：

Array 
(
    [0] => Array 
     (
      [id] => 1 
      [product_name] => prod_1 
     ) 

    [1] => Array 
     (
      [id] => 2 
      [product_name] => prod_2 
     ) 

    [2] => Array 
     (
      [id] => 3 
      [product_name] => prod_3 
     ) 

) 

结果将打印：

Array 
(
    [product_name] => Array 
     (
      [0] => prod_1 
      [1] => prod_2 
      [2] => prod_3 
     ) 

    [product_id] => Array 
     (
      [0] => 1 
      [1] => 2 
      [2] => 3 
     ) 
) 

Answer 2

你有没有尝试GROUP_CONCAT。它是这样的：

SELECT name, GROUP_CONCAT(name) AS friends FROM friendships GROUP BY name; 

对这里的细节来看看：http://forums.mysql.com/read.php?10,287931,287936#msg-287936

Answer 3

$yourarray = array(array('id'=>1, 'product_name' => 'prod_1'), array('id'=>2, 'product_name' => 'prod_1'), array('id'=>3, 'product_name' => 'prod_1'),array('id'=>4, 'product_name' => 'prod_1')); 

$multiarray = array(); 
foreach ($yourarray as $value) { 
    if(!isset($multiarray['product_name'])) { 
     $multiarray['product_name'] = $value['product_name']; 
    }  
    $multiarray['categories'][] = $value['id']; 
} 
print_r($multiarray);