How to Remove Array Element and Then Re-index Array

How to Remove Array Element and Then Re-Index Array?

unset($foo[0]); // remove item at index 0
$foo2 = array_values($foo); // 'reindex' array

Removing nth element from an array and reindex it

use array_splice($array, 3, 1);

http://php.net/manual/en/function.array-splice.php

remove element from array and reindex from 0

try

unset($array['REF_DETAILS'][1]);
$array['REF_DETAILS'] = array_values($array['REF_DETAILS']);

How to remove JavaScript array element and reset keys

If I am understanding this correctly you want to remove array element at index 2 and re-index the array so there is no empty space. If that's the case javascript has got you covered.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice

fields.splice(2,1); // This modifies your original array and removes only one element starting at index 2. 

Deleting an element from an array in PHP

There are different ways to delete an array element, where some are more useful for some specific tasks than others.

Deleting a single array element

If you want to delete just one array element you can use unset() or alternatively \array_splice().

If you know the value and don’t know the key to delete the element you can use \array_search() to get the key. This only works if the element does not occur more than once, since \array_search returns the first hit only.

unset()

Note that when you use unset() the array keys won’t change. If you want to reindex the keys you can use \array_values() after unset(), which will convert all keys to numerically enumerated keys starting from 0.

Code:

$array = [0 => "a", 1 => "b", 2 => "c"];
unset($array[1]);
          // ↑ Key which you want to delete

Output:

[
    [0] => a
    [2] => c
]

\array_splice() method

If you use \array_splice() the keys will automatically be reindexed, but the associative keys won’t change — as opposed to \array_values(), which will convert all keys to numerical keys.

\array_splice() needs the offset, not the key, as the second parameter.

Code:

$array = [0 => "a", 1 => "b", 2 => "c"];
\array_splice($array, 1, 1);
                   // ↑ Offset which you want to delete

Output:

[
    [0] => a
    [1] => c
]

array_splice(), same as unset(), take the array by reference. You don’t assign the return values of those functions back to the array.

Deleting multiple array elements

If you want to delete multiple array elements and don’t want to call unset() or \array_splice() multiple times you can use the functions \array_diff() or \array_diff_key() depending on whether you know the values or the keys of the elements which you want to delete.

\array_diff() method

If you know the values of the array elements which you want to delete, then you can use \array_diff(). As before with unset() it won’t change the keys of the array.

Code:

$array = [0 => "a", 1 => "b", 2 => "c", 3 => "c"];
$array = \array_diff($array, ["a", "c"]);
                          // └────────┘
                          // Array values which you want to delete

Output:

[
    [1] => b
]

\array_diff_key() method

If you know the keys of the elements which you want to delete, then you want to use \array_diff_key(). You have to make sure you pass the keys as keys in the second parameter and not as values. Keys won’t reindex.

Code:

$array = [0 => "a", 1 => "b", 2 => "c"];
$array = \array_diff_key($array, [0 => "xy", "2" => "xy"]);
                               // ↑           ↑
                               // Array keys which you want to delete

Output:

[
    [1] => b
]

If you want to use unset() or \array_splice() to delete multiple elements with the same value you can use \array_keys() to get all the keys for a specific value and then delete all elements.

\array_filter() method

If you want to delete all elements with a specific value in the array you can use \array_filter().

Code:

$array = [0 => "a", 1 => "b", 2 => "c"];
$array = \array_filter($array, static function ($element) {
    return $element !== "b";
    //                   ↑
    // Array value which you want to delete
});

Output:

[
    [0] => a
    [1] => c
]

Remove multiple elements from array and reindex

You can do do it this way:

$new_array = array();

foreach ($array as $k => $v) {
    if ($k > 2 && $v['value'] == 2) {
        $new_array[] = $v;
    }
}

print_r($new_array);

Remove key from mixed array and reindex

You can filter the array by their key. Live demo.

unset($array['status']);
$number_keys = array_values(array_filter($array, function($k){return is_int($k) && $k != 1;}, ARRAY_FILTER_USE_KEY));
$nonnumber_keys = array_filter($array, function($k){return is_string($k);}, ARRAY_FILTER_USE_KEY);
$result = array_merge($number_keys, $nonnumber_keys);

How do I remove an item from an array by value but keep the original index order?

If you want to keep the index instead of slicing set the index value to undefined...

var arr = [5, 15, 110, 210, 550];var index = arr.indexOf(5);
if (index > -1) {   arr[index] = undefined;}console.log(arr);
arr.forEach(function(item){  if(item !== undefined){    console.log(item);  }});