Question

我有两个数组

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
  )
)

我想将fMaxtTemp的{{1}} amd fMinTemp切换为Array2的{{1}}，仅用于Array2的第一个元素。所以

Array1

将成为

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

Answer 1

这是一个简单的解决方案：

新版本回应DaveRandom的评论：

<?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，如果你想得到想象并在你想要的任意数量的阵列位置替换尽可能多的键：

<?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>";

Answer 2

// 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'];

切换数组子数组的第一个元素

2 个答案: