How to rebuild index after deleting elements from php array?

$arr = array('a','b','c','d');
unset($arr[1]);
print_r($arr);
 ?>

print_r($arr), the result is not like that. The final result is Array ( [0] => a [2] => c [3] => d )

How can missing elements be filled and the array re-indexed?

Use array_splice():

$arr = array('a','b','c','d');
array_splice($arr,1,1);
print_r($arr) ;
?>
After print_r($arr), the result is A(bbs.it-home.org)rray ( [0] => a [1] => c [2] => d )

2, delete the specified element of the array array_search() is more practical The array_search() function, like in_array(), searches for a key value in an array. If the value is found, the key of the matching element is returned. If not found, return false

$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'); If you want to re-index the array, you need to use foreach to traverse the deleted array and then re-create an array.