使用array_filter PHP后出现未定义的偏移量错误

Question

我以前在分解后对数组进行计数，使用可以解决，array_filter但是现在当我回显数组中的元素时，它给了我未定义的偏移量错误

$exclude=array();
$exclude[0]="with";
$exclude[1]="do";

$search="moving on with my car";
$sch1 = str_replace($exclude,"", trim($search));
$sch2 = explode(" ",trim($sch1));
$sch = array_filter($sch2);
// The value of the count is actually 4

// But when i try to display throws an indefined offset error
echo $sch[0]; 
echo $sch[1]; 
echo $sch[2]; // Throwing an "Undefined offset: 2" Error

任何帮助将不胜感激 。谢谢

Answer 1

array_filter()删除等于的数组的所有条目FALSE，从而在数组中创建间隙。

这是$sch2包含：

Array
(
    [0] => moving
    [1] => on
    [2] => 
    [3] => my
    [4] => car
)

在上申请array_filter()时$sch2，您将获得一个类似于以下内容的数组：

Array
(
    [0] => moving
    [1] => on
    [3] => my
    [4] => car
)

As you can see, index 2 is not defined. You need to re-index the array numerically for this to work. You can use array_values() for this purpose:

$sch = array_values(array_filter($sch2));

Demo