php array[0]（array(0)）

In PHP, array[0] is not a valid syntax. To access the element at index 0 of an array, you need to use the square bracket notation with the array variable followed by the index number.

If you have an array variable named $array, you can access the element at index 0 like this:

$element = $array[0];

However, in the example you provided, array(0), it seems like you are trying to create an empty array. In PHP, you can create an empty array using the array() construct or the [] shorthand notation. So, to create an empty array, you can do:

$array = array();
// or
$array = [];

Then, you can access the element at index 0, but since the array is empty, there won't be any element at that index.