Array_reverse "again"

Question

这是我的第一个post，所以请indulgent/lenient。

这个数组是刺绣程序的步骤枚举

而且我必须在非空步骤之间保持“0”值，并且在

之后不要采用空值

$oldArray = Array
("1278","1297","1278","1000","0","1000","1212","1001","1212","1278","1000",
"0","1297","1001","1000","0","1001","1278","1000","1001","1001","1278", 
"0","1000","1001","0","0","0","0","0","0","0","0","0","0",
"0","0","0","0","0","0","0","0","0","0","0","0","0","0"
);

我第一次反推，发现第一个非空值:

$arrayReversed = array_reverse($oldArray);  

$lastKey = 48;

foreach ($arrayReversed as $key => $value) {
    # If the value is not empty 
    if (!empty($value)) {

[FR] -> remplir un nouveau tableau avec les valeurs en partant de l'index "$key" jusqu'a "$lastKey"

[ENG] -> fill a new array with values starting from the first key with not null value to the last key Edit : Here was my error

        $sequencesFromEnd[] = array_slice($arrayReversed,$key,$lastKey);

I have it corrected with this code :

        $sequencesFromEnd = array_slice($arrayReversed,$key,$lastKey);
        break;

    }
    $key++;
}

编辑：然后它像我预期的那样工作！

然后我想反转"again"具有值的数组，以便按正确的顺序执行步骤，此代码是不工作：

//First try

$stepsInRightOrder = array_reverse($sequencesFromEnd);

// Second try

//array_reverse($stepsInRightOrder);

Second try commented because it is a no-op.

不幸的是，数组在 "foreach" 循环中保持原样 ...

非常感谢!!

Answer 1

你其实不是在反转数组。第一个 array_reverse 将数组反转为

0-> 1278
1-> 1297
2-> 1278
3-> 1000 etc...

在第一个array_reverse $arrayReverse 之后包含

etc...
0-> 1000
1-> 1278
2-> 1297
3-> 1278

请注意，只有数组中的值被反转，因为您没有明确保留键。然后你通过一个foreach循环，如果值不为空，你把一个新数组，从当前键到key+48元素放入一个新数组，这意味着你实际上在一个数组中有一个数组，然后 break 离开 foreach 循环，所以数组将只包含一个数组，然后你反转，但是因为它只包含一个数组，所以它向后是一样的：

0-> etc...
    0-> 1000
    1-> 1278
    2-> 1297
    3-> 1278

您只反转包含 1 个元素的外部数组。

（有点不清楚...所以 $sequencesFromEnd[] 实际上是将一个数组添加到一个新数组中。您可能只想使用 $sequencesFromEnd = array_slice(...)，或 array_reverse($sequencesFromEnd[$some_key]))

Answer 2

如果您想删除尾随零

// Find the last not zero value 
$lastkey = count($oldArray)-1;
while($lastkey and ! $oldArray[$lastkey ]) --$lastkey;
// Slice array
$stepsInRightOrder = array_slice($oldArray, 0, $lastkey+1);
print_r($stepsInRightOrder);

demo

Array_reverse "again"

Array_reverse "again"

php

arrays

array-reverse