Php 切换数组子数组的第一个元素
我有两个数组 阵列1:Php 切换数组子数组的第一个元素,php,Php,我有两个数组 阵列1: Array ( [0] => Array ( [fStartValidTime] => 2012-03-13 [fMaxTemp] => 7 [fMinTemp] => 2 ) [1] => Array ( [fStartValidTime] => 2012-03-14 [fMaxTemp] => 7 [fMinTemp] => 5 ) [2] =>
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
)
)
阵列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Array2的fMaxtTemp
amdfMinTemp
切换到Array1的fMinTemp
,只用于Array2的第一个元素。所以
[2] => Array (
[fStartValidTime] => 2012-03-13T16:00:00-7:00
[fMaxTemp] => 6
[fMinTemp] => 6
[fWeatherType] => chancerain
[fProbability] => likely
[fCloudCoverPercent] => 20
)
将成为
[2] => Array (
[fStartValidTime] => 2012-03-13T16:00:00-7:00
[fMaxTemp] => 7
[fMinTemp] => 2
[fWeatherType] => chancerain
[fProbability] => likely
[fCloudCoverPercent] => 20
)
以下是一个简单的解决方案:
回应DaveRandom评论的新版本:
<?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'] = $array1[0]['fMinTemp'];
}
将['0']
替换为[0]
,这样就可以了!不会,因为数组2的索引是2
。这就是为什么我的答案使用方法,使第一个元素的关键是什么无关。我怀疑这就是重点,因为一个简单的任务很少会在这里引发问题。。。
<?php
if ( count($array1) > 0 && count($array2) > 0 ) { // Prevent PHP Notice for empty arrays
$array2['0']['fMaxTemp'] = $array1['0']['fMaxTemp'];
$array2['0']['fMinTemp'] = $array1['0']['fMinTemp'];
}
<?php
public function swap_array_values($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>";
// 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'];