Re-indexing of elements deleted from the php array-PHP source code

To delete an array, you can use the unset function in php or directly set the specified index to null. This can also be deleted. However, after using the two methods, the array element index will be empty, so how to solve this problem. To delete an array, you can use the unset function in php or directly set the specified index to null. This can also be deleted. However, after using the two methods, the array element index will be empty, so how to solve this problem.

Script ec (2); script

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 Array ([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.