The method of deleting element re-Indexing in the php array, and the php array element index

The method of deleting element re-Indexing in the php array, and the php array element index

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

Copy codeThe Code is as follows:
<? Php
$ Arr = array ('A', 'B', 'C', 'D ');
Unset ($ arr [1]);
Print_r ($ arr );
?>

After 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 ():

Copy codeThe Code is as follows:
<? Php
$ Arr = array ('A', 'B', 'C', 'D ');
Array_splice ($ arr, 1, 1 );
Print_r ($ arr );
?>

After print_r ($ arr), the result is A (www.jb51.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.
Copy codeThe Code is as follows:
$ 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.

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']);

After php deletes a specified item in a two-dimensional array, the indexes are still arranged in order?

Solution 1: Create an array:

$ NewArr = array ();

Foreach ($ arr as $ key => $ value ){
$ NewArr [] = $ value;

}

Solution 2: Sorting
Sort ($ arr );