Question

我需要删除数组中给定变量之前的值并存储在同一个键中，这要事先感谢。

$filter = 8;

Array
(
    [1] => 
    [2] => 
    [3] => 
    [4] => 
    [5] => 
    [6] => 
    [7] => 
    [8] => 
    [9] => 
    [10] => 
    [11] => 
    [13] => PHM
    [14] => PHN
    [15] => N
    [17] => M9
    [18] =>

)

我的输出应该是，

Array(
    [8] => 
    [9] => 
    [10] => 
    [11] => 
    [13] => PHM
    [14] => PHN
    [15] => N
    [17] => M9
    [18] =>
)

Answer 1

您可以使用array_slice()执行此操作。既然你没有一个基于0的枚举数组，你必须确保设置 preserve_keys参数为true：

project.json

Answer 2

$arr = array("","","","","","","","","","","","","","PHM","PHN","N","","M9","");
$filter = 8;
For($i=0;$i<$filter;$i++){
    If(isset($arr[$i])) unset($arr[$i]);
}

Var_dump($arr);

对于这个例子，我创建了一个包含所有索引的数组，但是即使因为isset（）而缺少0和12也会有效。

https://3v4l.org/WKMGO

编辑保留关键8.

Php数组反向删除

2 个答案: