给定一个关联数组:
array("key1" => "value1", "key2" => "value2", ...)
如何根据键删除特定的键值对?
unset
:unset($array['key-here']);
例子:
$array = array("key1" => "value1", "key2" => "value2");
print_r($array);
unset($array['key1']);
print_r($array);
unset($array['key2']);
print_r($array);
输出:
Array
(
[key1] => value1
[key2] => value2
)
Array
(
[key2] => value2
)
Array
(
)
function array_except($array, $keys) {
return array_diff_key($array, array_flip((array) $keys));
}
第一个参数传递整个数组,第二个参数设置要删除的键的数组。
例如:
$array = [
'color' => 'red',
'age' => '130',
'fixed' => true
];
$output = array_except($array, ['color', 'fixed']);
// $output now contains ['age' => '130']
$output = array_except($array_1, ['color', 'fixed']);
上关闭引号。 - Abraham Brookesfunction array_extract($array, $keys) {
return array_intersect_key($array, array_flip((array) $keys));
}
$output = array_extract($array, ['color', 'fixed']);
print_r($output); //Array ( [color] => red [fixed] => 1 );
- Sahil Kashyap使用unset
:
unset($array['key1'])
考虑下面这个数组:
$arr = array("key1" => "value1", "key2" => "value2", "key3" => "value3", "key4" => "value4");
To remove an element using the array key
:
// To unset an element from array using Key:
unset($arr["key2"]);
var_dump($arr);
// output: array(3) { ["key1"]=> string(6) "value1" ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
To remove element by value
:
// remove an element by value:
$arr = array_diff($arr, ["value1"]);
var_dump($arr);
// output: array(2) { ["key3"]=> string(6) "value3" ["key4"]=> string(6) "value4" }
了解更多关于array_diff的内容:http://php.net/manual/en/function.array-diff.php
To remove an element by using index
:
array_splice($arr, 1, 1);
var_dump($arr);
// array(1) { ["key3"]=> string(6) "value3" }
阅读有关array_splice的更多信息:http://php.net/manual/zh/function.array-splice.php
$arr[$key1][$key2][$key3]=$value1; // ....etc
foreach ($arr as $key1 => $values) {
foreach ($values as $key2 => $value) {
unset($arr[$key1][$key2]);
}
}
$array = ['name' => 'Desk', 'price' => 100];
$filtered = Arr::except($array, ['price']);
// ['name' => 'Desk']
$array = ['name' => 'Desk', 'price' => 100];
$name = Arr::pull($array, 'name');
// $name: Desk
// $array: ['price' => 100]
foreach
循环内执行这些编辑操作,那么你需要在枚举变量前加上一个“&”符号,以允许写入权限。 - FreeAsInBeer