在PHP中，我有这样的数组：
Array
(
[0] => 09:26-DOWN
[1] => 09:26-UP
[2] => 09:26-UP
[3] => 09:26-UP
[4] => 09:26-UP
[5] => 09:26-UP
[6] => 09:26-UP
[7] => 09:26-UP
[8] => 09:26-DOWN
[9] => 09:26-UP
[10] => 09:26-UP
[11] => 09:26-UP
[12] => 09:26-UP
[13] => 09:26-UP
[14] => 09:26-UP
[15] => 09:26-UP
[16] => 09:26-UP
[17] => 09:26-UP
)
我想把它和下面的数组进行比较，只和最后一个字符（向上和向下）进行比较：
Array
(
[0] => 09:31-DOWN
[1] => 09:31-UP
[2] => 09:31-UP
[3] => 09:31-UP
[4] => 09:31-UP
[5] => 09:31-UP
[6] => 09:31-UP
[7] => 09:31-UP
[8] => 09:31-UP
[9] => 09:31-UP
[10] => 09:31-UP
[11] => 09:31-UP
[12] => 09:31-UP
[13] => 09:31-UP
[14] => 09:31-UP
[15] => 09:31-UP
[16] => 09:31-UP
[17] => 09:31-UP
)
因此，目的是检查它在特定时间之间是上升还是下降。
不太确定要做什么，但这里有一个简单的选项。假设每个元素的格式总是相同的，即HH:II-[UP or DOWN]，您可以这样做：
$result = array();
foreach ($arr1 as $k=>$v) {
$result[] = $v[6] . $arr2[$k][6];
}
给定两个数组$arr1和$arr2，这将产生第三个数组，如：
Array
(
[0] => DD
[1] => UU
[2] => UU
[3] => UU
[4] => UU
....
)
然后，您可以使用此数组的值UU、DD、UD、DU来计算每个位置中的内容。例如，键3将具有UU，所以您知道它是UP，UP。。。。
查看演示
<小时>更新以下是使用array_map（）的单行版本：
$result = array_map(function($a, $b){return $a[6] . $b[6];}, $arr1, $arr2);
请参阅演示2
尝试使用strstr()+trim()来分割状态/状态。
$changed = []; // to store changed statuses
foreach($old as $i => $value){
$from = trim(strstr($value, '-'), '-'); // getting status (UP / DOWN) from first array
$to = trim(strstr($new[$i], '-'), '-'); // getting status (UP / DOWN) from second array
if($from != $to){ // if statuses are different
$changed[$i] = [
'from' => $from,
'to' => $to
]; // add to changed array
}
}
完整示例：
<?php
header('Content-Type: text/plain; charset=utf-8');
$old = [
'09:26-DOWN',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-DOWN',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP',
'09:26-UP'
];
$new = [
'09:31-DOWN',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP',
'09:31-UP'
];
$changed = [];
foreach($old as $i => $value){
$from = trim(strstr($value, '-'), '-');
$to = trim(strstr($new[$i], '-'), '-');
if($from != $to){
$changed[$i] = [
'from' => $from,
'to' => $to
];
}
}
print_r($changed);
?>
输出：
Array
(
[8] => Array
(
[from] => DOWN
[to] => UP
)
)
给两个数组
<?php
$array1 = array('UP', 'DOWN', 'UP', 'DOWN');
$array2 = array('UP', 'DOWN', 'DOWN', 'UP');
foreach ($array2 as $key => $new_value)
{
$old_value = $array1[$key];
$new_array[$key] = ($old_value <= $new_value ? (($old_value < $new_value) ? 'UP' : 'NO CHANGE') : 'DOWN');
}
var_dump($new_array);
将输出类似于此的内容
array(4) {
[0]=>
string(9) "NO CHANGE"
[1]=>
string(9) "NO CHANGE"
[2]=>
string(4) "DOWN"
[3]=>
string(2) "UP"
}