Re-indexing of deleted elements in php array, php array element index_PHP tutorial

Re-indexing of deleted elements in php array, php array element index

If you want to delete an element in an array, you can use unset directly, but what I saw today Something surprised me

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

print_r($arr)

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

So how can the missing elements be filled and the array re-indexed? 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 )

Delete the specified element from the array

array_search() is more practical

The array_search() function is the same as in_array(), searching for a key value in the 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');

But if you want to re-index the array, you need to use foreach to traverse the deleted array and then re-create an array. This is also possible.
From php tutorial website: http://www.111cn.net/phper/php-cy/66372.htm

How to delete array key value in php Make it an indexed array

array_values() returns all the values ​​in the input array and indexes them numerically.

array_value($arr['date']);

php delete elements in array

unset($arr[1]);

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