PHP多维数组合并

Question

我有3套数组的已经从一个API（$数组1，$数组2，$ ARRAY3）返回

我需要最高这些组合成1个对象地面，第二天，一夜之间的价格价值。

$obj['ground'] should equal 3.15 
$obj['2 Day'] should equal 19.29 
$obj['Overnight'] should equal 29.26 

ARR1

Array 
(
    [0] => Array 
     (
      [Title] => Ground 
      [Price] => 3.15 
     ) 

    [1] => Array 
     (
      [Title] => 2 Day 
      [Price] => 12.11 
     ) 

    [2] => Array 
     (
      [Title] => 1 Day 
      [Price] => 29.26 
     ) 

) 

ARR2

Array 
(
    [0] => Array 
     (
      [Title] => Ground 
      [Price] => 3.15 
     ) 

    [1] => Array 
     (
      [Title] => 2 Day 
      [Price] => 19.29 
     ) 

    [2] => Array 
     (
      [Title] => 1 Day 
      [Price] => 25.89 
     ) 

) 

ARR3

Array 
(
    [0] => Array 
     (
      [Title] => Ground 
      [Price] => 3.15 
     ) 

    [1] => Array 
     (
      [Title] => 2 Day 
      [Price] => 16.29 
     ) 

    [2] => Array 
     (
      [Title] => 1 Day 
      [Price] => 25.89 
     ) 

) 

什么是这样做的最佳方式？

Answer 1

一种不同的方法。更实用，更简单，更不容易出错。

// Prepare result 
$result = array_fill_keys([ 'ground', '2 Day', '1 Day' ], 0.0); 

// Find the highest price and keep it in the result 
$result = array_reduce(array_merge($array1, $array2, $array3), function ($result, $item) { 
    if ($item['Price'] > $result[$item['Title']]) { 
     $result[$item['Title']] = $item['Price']; 
    } 
    return $result; 
}, $result); 

print_r($result); 

输出：

Array 
(
    [ground] => 3.15 
    [2 Day] => 19.29 
    [1 Day] => 29.26 
) 

这种方法的好处是，它依靠内置的功能，可以很容易地扩展到更多的冠军和多个阵列。

Answer 2

您可以将您所需要的结果：

<? 
// Your test array 1 
$arr1[] = array('Title'=>'Ground','Price'=>'3.15'); 
$arr1[] = array('Title'=>'2 Day','Price'=>'12.11'); 
$arr1[] = array('Title'=>'1 Day','Price'=>'29.26'); 

foreach ($arr1 as $key => $value) { 
    $newArr[$value['Title']] = $value['Price'];  
} 

echo "<pre>"; 
print_r($newArr); // result of array1, you can follow this for other arrays as well 
?> 

结果：

Array 
(
    [Ground] => 3.15 
    [2 Day] => 12.11 
    [1 Day] => 29.26 
) 

更新1：

<? 
$arr1[] = array('Title'=>'Ground','Price'=>'3.15'); 
$arr1[] = array('Title'=>'2 Day','Price'=>'12.11'); 
$arr1[] = array('Title'=>'1 Day','Price'=>'29.26'); 

$arr2[] = array('Title'=>'Ground','Price'=>'3.15'); 
$arr2[] = array('Title'=>'2 Day','Price'=>'19.29'); 
$arr2[] = array('Title'=>'1 Day','Price'=>'25.89'); 

$arr3[] = array('Title'=>'Ground','Price'=>'3.15'); 
$arr3[] = array('Title'=>'2 Day','Price'=>'16.29'); 
$arr3[] = array('Title'=>'1 Day','Price'=>'25.89'); 

$customArr = array(); 
foreach ($arr1 as $key => $value) { 
    $customArr[$key][$value['Title']][] = $value['Price'];  
} 

foreach ($arr2 as $key => $value) { 
    $customArr[$key][$value['Title']][] = $value['Price'];  
} 

foreach ($arr3 as $key => $value) { 
    $customArr[$key][$value['Title']][] = $value['Price'];  
} 

$finalArr = array(); 
foreach ($customArr as $key => $value) { 

    if(isset($value['Ground'])) 
     $finalArr['Ground'] = max($value['Ground']); 

    if(isset($value['2 Day'])) 
     $finalArr['2 Day'] = max($value['2 Day']); 

    if(isset($value['1 Day'])) 
     $finalArr['1 Day'] = max($value['1 Day']); 
} 

echo "<pre>"; 
print_r($finalArr);  

?> 

结果：

Array 
(
    [Ground] => 3.15 
    [2 Day] => 19.29 
    [1 Day] => 29.26 
) 

Answer 3

 $array1 = array(
     array("Title"=>"ground", "Price"=>3.15), 
     array("Title"=>"2 Day", "Price"=>12.11), 
     array("Title"=>"1 Day", "Price"=>29.26) 
     ); 
    $array2 = array(
     array("Title"=>"ground", "Price"=>3.15), 
     array("Title"=>"2 Day", "Price"=>19.29), 
     array("Title"=>"1 Day", "Price"=>25.89) 
    ); 
    $array3 = array(
     array("Title"=>"ground", "Price"=>3.15), 
     array("Title"=>"2 Day", "Price"=>16.29), 
     array("Title"=>"1 Day", "Price"=>25.89) 
    ); 
    $obj = new stdClass(); /** you asked object. */ 
    $size = count($array1); 
/** Loops runs three time, `ground`, `2 Day` and `1 Day` will be sorted respectively in each iteration */ 
    for ($i = 0; $i<$size; $i++) { 
     $maxValue = max(array($array1[$i]["Price"], $array2[$i]["Price"], $array3[$i]["Price"])); 
     switch ($array1[$i]["Title"]) { 
      case "ground": $obj->ground = $maxValue; 
       break; 
      /** '2 day' is not possible since object properties can not contain space. */ 
      case "2 Day": $obj->twoDay = $maxValue; 
       break; 
      case "1 Day": $obj->overNight = $maxValue; 
       break; 
     } 
    } 
    var_dump($obj);