Delete element re-indexing in php array, php array element indexing _ PHP Tutorial

Re-indexing of elements deleted from the php array, and indexing of elements in the php array. The php array deletes the element re-index. if you want to delete an element from an array, you can directly use the unset, but what I saw today surprised me by the re-indexing of elements deleted from the php array, and the element indexing of the php array.

If you want to delete an element from an array, you can use the unset directly, but what you see today surprised me.

$ Arr = array ('A', 'B', 'C', 'D ');
Unset ($ arr [1]);
Print_r ($ arr );
?>

Print_r ($ arr)

The result is not that. The final result is Array ([0] => a [2] => c [3] => d)

So how can we fill in the missing elements and re-index the array? The answer is:

Array_splice ():

$ Arr = array ('A', 'B', 'C', 'D ');
Array_splice ($ arr, 1, 1 );
Print_r ($ arr );
?>

After print_r ($ arr), the result is A (www.111cn.net) rray ([0] => a [1] => c [2] => d)

Deletes the specified element of an array.

Array_search () is more practical.

The array_search () function is the same as the in_array () function. you can find a key value in the array. If this value is found, the key name of the matching element is returned. If not found, false is returned.
$ Array = array ('1', '2', '3', '4', '5 ');
$ Del_value = 3;
Unset ($ array [array_search ($ del_value, $ array)]); // use unset to delete this element
Print_r ($ array );
Output
Array ('1', '2', '4', '5 ');

However, if you want to re-index the array, you need to use foreach to traverse the deleted array and re-create an array.
From php Tutorial: http://www.111cn.net/phper/php-cy/66372.htm

How can I delete an array key value in php to make it an index array?

Array_values () returns all values in the input array and creates a digital index for them.

Array_value ($ arr ['Date']);

Php deletes elements in an array

Unset ($ arr [1]);

If you want to delete an element from an array, you can use the unset directly, but what you see today surprised me...