開關的陣列的子陣列的第一個元素

ARRAY 1：

Array (
    [0] => Array (
    [fStartValidTime] => 2012-03-13 
    [fMaxTemp] => 7 
    [fMinTemp] => 2 
) 
    [1] => Array (
    [fStartValidTime] => 2012-03-14 
    [fMaxTemp] => 7 
    [fMinTemp] => 5 
) 
    [2] => Array (
    [fStartValidTime] => 2012-03-15 
    [fMaxTemp] => 10 
    [fMinTemp] => 5 
) 
    [3] => Array (
    [fStartValidTime] => 2012-03-16 
    [fMaxTemp] => 10 
    [fMinTemp] => 1 
) 
    [4] => Array (
    [fStartValidTime] => 2012-03-17 
    [fMaxTemp] => 7 
    [fMinTemp] => 3 
) 
    [5] => Array (
    [fStartValidTime] => 2012-03-18 
    [fMaxTemp] => 7 
    [fMinTemp] => 3 
) 
    [6] => Array (
    [fStartValidTime] => 2012-03-19 
    [fMaxTemp] => 7 
    [fMinTemp] => 1 
) 
)

ARRAY 2：

Array (
    [2] => Array (
    [fStartValidTime] => 2012-03-13T16:00:00-7:00 
    [fMaxTemp] => 6 
    [fMinTemp] => 6 
    [fWeatherType] => chancerain 
    [fProbability] => likely 
    [fCloudCoverPercent] => 20 
) 
    [5] => Array (
    [fStartValidTime] => 2012-03-13T19:00:00-7:00 
    [fMaxTemp] => 6 
    [fMinTemp] => 6 
    [fWeatherType] => chancerain 
    [fProbability] => likely 
    [fCloudCoverPercent] => 20 
) 
    [8] => Array (
    [fStartValidTime] => 2012-03-13T22:00:00-7:00 
    [fMaxTemp] => 5 
    [fMinTemp] => 5 
    [fWeatherType] => chancerain 
    [fProbability] => likely 
    [fCloudCoverPercent] => 20 
) 
)

我想切換的Array2的fMaxtTemp AMD fMinTemp僅爲Array2的第一個元素的Array1。所以

[2] => Array (
    [fStartValidTime] => 2012-03-13T16:00:00-7:00 
    [fMaxTemp] => 6 
    [fMinTemp] => 6 
    [fWeatherType] => chancerain 
    [fProbability] => likely 
    [fCloudCoverPercent] => 20 
)

將成爲

[2] => Array (
    [fStartValidTime] => 2012-03-13T16:00:00-7:00 
    [fMaxTemp] => 7 
    [fMinTemp] => 2 
    [fWeatherType] => chancerain 
    [fProbability] => likely 
    [fCloudCoverPercent] => 20 
)

來源

2012-03-13 Autolycus

這裏有一個簡單的解決方案：

新版本響應DaveRandom的評論：

<?php 
$tmp = array_keys($array2); 
$array2_first_idx = $tmp[0]; 
if (count($array1) > 0 && count($array2) > 0) { // Prevent PHP Notice for empty arrays 
    $array2[$array2_first_idx]['fMaxTemp'] = $array1[0]['fMaxTemp']; 
    $array2[$array2_first_idx]['fMinTemp'] = $array1[0]['fMinTemp']; 
}

原始版本：

<?php 
if (count($array1) > 0 && count($array2) > 0) { // Prevent PHP Notice for empty arrays 
    $array2['0']['fMaxTemp'] = $array1['0']['fMaxTemp']; 
    $array2['0']['fMinTemp'] = $array1['0']['fMinTemp']; 
}

或者，如果你想獲得幻想，並在儘可能多的陣列位置取代儘可能多的按鍵，只要你想：

<?php 
public function swap_array_values($a1, $a2, $pos, $keys) 
{ 
    $tmp = $a2; 

    foreach ($pos AS $idx) { 
     // Make sure we have a value in the position we want to swap 
     if (array_key_exists($idx, $a1) && array_key_exists($idx, $a2)) { 
      foreach ($keys AS $key) { 
       if (array_key_exists($key, $a1[$idx]) && array_key_exists($key, $a2[$idx])) { 
        $tmp[$idx][$key] = $a1[$idx][$key]; 
       } 
      } 
     } 
    } 

    return $tmp; 
} 

// ------------------------------------------------------------------- 

$positions = array('0'); 
$swap_keys = array('fMaxTemp', 'fMinTemp'); 

echo "Before:<br/>"; 
echo "<strong>Array 1</strong><pre>"; print_r($array1); echo "</pre>"; 
echo "<strong>Array 2</strong><pre>"; print_r($array2); echo "</pre>"; 

$array2 = swap_array_values($array1, $array2, $positions, $swap_keys); 

echo "<hr/>After:<br/>"; 
echo "<strong>Array 2</strong><pre>"; print_r($array2); echo "</pre>";

來源

2012-03-13 21:02:38 augustknight

替換'[0]'和' ''這會做！ – Basti 2012-03-13 21:10:37

不可以，因爲數組2的索引是'2'。這就是爲什麼我的答案使用方法使第一個元素的關鍵是無關緊要的原因。我懷疑的是整個觀點，因爲一個簡單的任務在這裏很少引發一個問題...... – DaveRandom 2012-03-13 21:15:20

// Make sure the array pointers are at the beginning 
reset($arr1); 
reset($arr2); 

// Get the the key of the first element from each array 
$k1 = key($arr1); 
$k2 = key($arr2); 

// Update the values in $arr1 with those from $arr2 
$arr2[$k2]['fMaxtTemp'] = $arr1[$k1]['fMaxtTemp']; 
$arr2[$k2]['fMintTemp'] = $arr1[$k1]['fMintTemp'];

來源

2012-03-13 21:10:13 DaveRandom

開關的陣列的子陣列的第一個元素

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