PHP：如何从数组中删除特定元素？

PHP: How to remove specific element from an array?

提问by dcp3450

How do I remove an element from an array when I know the elements name? for example:

当我知道元素名称时，如何从数组中删除元素？例如：

I have an array:

我有一个数组：

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');

the user enters strawberry

用户输入 strawberry

strawberryis removed.

strawberry已移除。

To fully explain:

全面解释：

I have a database that stores a list of items separated by a comma. The code pulls in the list based on a user choice where that choice is located. So, if they choose strawberry they code pulls in every entry were strawberry is located then converts that to an array using split(). I want to them remove the user chosen items, for this example strawberry, from the array.

我有一个数据库，用于存储以逗号分隔的项目列表。该代码根据该选项所在的用户选择拉入列表。因此，如果他们选择草莓，他们的代码会在草莓所在的每个条目中提取代码，然后使用 split() 将其转换为数组。我希望他们从数组中删除用户选择的项目，例如草莓。

回答by Gumbo

Use array_searchto get the key and remove it with unsetif found:

使用array_search拿到钥匙，并删除它unset一旦发现：

if (($key = array_search('strawberry', $array)) !== false) {
    unset($array[$key]);
}

array_searchreturns false(nulluntil PHP 4.2.0) if no item has been found.

array_search如果未找到任何项目，则返回false（在 PHP 4.2.0 之前为null）。

And if there can be multiple items with the same value, you can use array_keysto get the keys to all items:

如果可以有多个具有相同值的项目，您可以使用array_keys获取所有项目的键：

foreach (array_keys($array, 'strawberry') as $key) {
    unset($array[$key]);
}

回答by ills

Use array_diff()for 1 line solution:

使用array_diff()1级的解决方案：

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi', 'strawberry'); //throw in another 'strawberry' to demonstrate that it removes multiple instances of the string
$array_without_strawberries = array_diff($array, array('strawberry'));
print_r($array_without_strawberries);

...No need for extra functions or foreach loop.

...不需要额外的函数或 foreach 循环。

回答by John Conde

if (in_array('strawberry', $array)) 
{
    unset($array[array_search('strawberry',$array)]);
}

回答by ericluwj

If you are using a plain array here (which seems like the case), you should be using this code instead:

如果您在此处使用普通数组（似乎是这种情况），则应改用以下代码：

if (($key = array_search('strawberry', $array)) !== false) {
    array_splice($array, $key, 1);
}

unset($array[$key])only removes the element but does not reorder the plain array.

unset($array[$key])只删除元素但不重新排序普通数组。

Supposingly we have an array and use array_splice:

假设我们有一个数组并使用 array_splice：

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');
array_splice($array, 2, 1);
json_encode($array); 
// yields the array ['apple', 'orange', 'blueberry', 'kiwi']

Compared to unset:

与未设置相比：

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');
unset($array[2]);
json_encode($array);
// yields an object {"0": "apple", "1": "orange", "3": "blueberry", "4": "kiwi"}

Notice how unset($array[$key])does not reorder the array.

请注意如何unset($array[$key])不对数组重新排序。

回答by srcspider

You can use array filter to remove the items by a specific condition on $v:

您可以使用数组过滤器按特定条件删除项目$v：

$arr = array_filter($arr, function($v){
    return $v != 'some_value';
});

回答by D.Martin

Will be like this:

会是这样：

 function rmv_val($var)
 {
     return(!($var == 'strawberry'));
 }

 $array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');

 $array_res = array_filter($array, "rmv_val");

回答by mmr

This is a simple reiteration that can delete multiple values in the array.

这是一个简单的重复，可以删除数组中的多个值。

    // Your array
    $list = array("apple", "orange", "strawberry", "lemon", "banana");

    // Initilize what to delete
    $delete_val = array("orange", "lemon", "banana");

    // Search for the array key and unset   
    foreach($delete_val as $key){
        $keyToDelete = array_search($key, $list);
        unset($list[$keyToDelete]);
    }

回答by jankal

I'm currently using this function:

我目前正在使用这个功能：

function array_delete($del_val, $array) {
    if(is_array($del_val)) {
         foreach ($del_val as $del_key => $del_value) {
            foreach ($array as $key => $value){
                if ($value == $del_value) {
                    unset($array[$key]);
                }
            }
        }
    } else {
        foreach ($array as $key => $value){
            if ($value == $del_val) {
                unset($array[$key]);
            }
        }
    }
    return array_values($array);
}

You can input an array or only a string with the element(s) which should be removed. Write it like this:

您可以输入一个数组或只输入一个包含应删除元素的字符串。像这样写：

$detils = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');
$detils = array_delete(array('orange', 'apple'), $detils);

OR

或者

$detils = array_delete('orange', $detils);

$detils = array_delete('orange', $detils);

It'll also reindex it.

它也会重新索引它。

回答by d?lo sürücü

Just u can do single line .it will be remove element from array

只是你可以做单行。它将从数组中删除元素

$array=array_diff($array,['strawberry']);

回答by Jordan Montel

This question has several answers but I want to add something more because when I used unsetor array_diffI had several problems to play with the indexes of the new array when the specific element was removed (because the initial index are saved)

这个问题有几个答案，但我想添加更多内容，因为当我使用unset或array_diff删除特定元素时我在处理新数组的索引时遇到了几个问题（因为保存了初始索引）

I get back to the example :

我回到这个例子：

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');
$array_without_strawberries = array_diff($array, array('strawberry'));

or

或者

$array = array('apple', 'orange', 'strawberry', 'blueberry', 'kiwi');
unset($array[array_search('strawberry', $array)]);

If you print the result you will obtain :

如果打印结果，您将获得：

foreach ($array_without_strawberries as $data) {
   print_r($data);
}

Result :

结果 ：

> apple
> orange
> blueberry
> kiwi

But the indexes will be saved and so you will access to your element like :

但是索引将被保存，因此您可以访问您的元素，例如：

$array_without_strawberries[0] > apple
$array_without_strawberries[1] > orange
$array_without_strawberries[3] > blueberry
$array_without_strawberries[4] > kiwi

And so the final array are not re-indexed. So you need to add after the unsetor array_diff:

所以最终的数组不会被重新索引。所以你需要在unsetor之后添加array_diff：

$array_without_strawberries = array_values($array);

After that your array will have a normal index :

之后，您的数组将具有正常索引：

$array_without_strawberries[0] > apple
$array_without_strawberries[1] > orange
$array_without_strawberries[2] > blueberry
$array_without_strawberries[3] > kiwi

Related to this post : Re-Index Array

与这篇文章相关：重新索引数组

Hope it will help

希望它会有所帮助