PHP比较两个数组之间的特定字符

Question

In PHP, I have array like this:

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
)

and I want to compare it with below array, only with the last characters (UP and DOWN):

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
)

So the purpose is to check if it up or down between the specific time.

Answer 1

Not exactly sure what you're trying to do, but here's a simple option. Assuming that the format of each element will always be the same, ie HH:II-[UP or DOWN], you could do this:

$result = array();
foreach ($arr1 as $k=>$v) {
    $result[] = $v[6] . $arr2[$k][6];
}

Given your two arrays, $arr1 and $arr2, this will yield a third array like:

Array
(
    [0] => DD
    [1] => UU
    [2] => UU
    [3] => UU
    [4] => UU
    ....
)

Then you can use this array's values, UU, DD, UD, DU, to figure out what is in each position. For example key 3 will have UU, so you know it is UP, UP....

See demo

---

Update Here's the one-liner version using array_map():

$result = array_map(function($a, $b){return $a[6] . $b[6];}, $arr1, $arr2);

See demo 2