辅助函数 数组和对象
Laravel 辅助函数 数组和对象
Arr::accessible()
Arr::accessible()
方法会检查给定值是否可以通过数组方式访问:
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
$isAccessible = Arr::accessible(['a' => 1, 'b' => 2]);
// true
$isAccessible = Arr::accessible(new Collection);
// true
$isAccessible = Arr::accessible('abc');
// false
$isAccessible = Arr::accessible(new stdClass);
// false
Arr::add()
Arr::add
方法将给定键值对添加到数组 —— 如果给定键不存在或对应值为空的话:
use Illuminate\Support\Arr;
$array = Arr::add(['name' => 'Desk'], 'price', 100);
// ['name' => 'Desk', 'price' => 100]
$array = Arr::add(['name' => 'Desk', 'price' => null], 'price', 100);
// ['name' => 'Desk', 'price' => 100]
Arr::collapse()
Arr::collapse()
方法将多个数组合并成一个:
use Illuminate\Support\Arr;
$array = Arr::collapse([[1, 2, 3], [4, 5, 6], [7, 8, 9]]);
// [1, 2, 3, 4, 5, 6, 7, 8, 9]
Arr::crossJoin
Arr::crossJoin
方法可以交叉连接给定数组,返回一个包含所有排列组合的笛卡尔乘积:
use Illuminate\Support\Arr;
$matrix = Arr::crossJoin([1, 2], ['a', 'b']);
/*
[
[1, 'a'],
[1, 'b'],
[2, 'a'],
[2, 'b'],
]
*/
$matrix = Arr::crossJoin([1, 2], ['a', 'b'], ['I', 'II']);
/*
[
[1, 'a', 'I'],
[1, 'a', 'II'],
[1, 'b', 'I'],
[1, 'b', 'II'],
[2, 'a', 'I'],
[2, 'a', 'II'],
[2, 'b', 'I'],
[2, 'b', 'II'],
]
*/
Arr::divide()
Arr::divide
方法返回两个数组,一个包含原数组的所有键,另外一个包含原数组的所有值:
use Illuminate\Support\Arr;
[$keys, $values] = Arr::divide(['name' => 'Desk']);
// $keys: ['name']
// $values: ['Desk']
Arr::dot()
Arr::dot
方法使用「.」号将将多维数组转化为一维数组:
use Illuminate\Support\Arr;
$array = ['products' => ['desk' => ['price' => 100]]];
$flattened = Arr::dot($array);
// ['products.desk.price' => 100]
Arr::except()
Arr::except
方法从数组中移除给定键值对:
use Illuminate\Support\Arr;
$array = ['name' => 'Desk', 'price' => 100];
$filtered = Arr::except($array, ['price']);
// ['name' => 'Desk']
Arr::exists()
Arr::exists()
方法检查给定键在数组中是否存在:
use Illuminate\Support\Arr;
$array = ['name' => 'John Doe', 'age' => 17];
$exists = Arr::exists($array, 'name');
// true
$exists = Arr::exists($array, 'salary');
// false
Arr::first()
Arr::first
方法返回通过测试数组的第一个元素:
use Illuminate\Support\Arr;
$array = [100, 200, 300];
$first = Arr::first($array, function ($value, $key) {
return $value >= 150;
});
// 200
默认值可以作为第三个参数传递给该方法,如果没有值通过测试的话返回默认值:
use Illuminate\Support\Arr;
$first = Arr::first($array, $callback, $default);
Arr::flatten()
Arr::flatten
方法将多维数组转化为一维数组:
use Illuminate\Support\Arr;
$array = ['name' => 'Joe', 'languages' => ['PHP', 'Ruby']];
$flattened = Arr::flatten($array);
// ['Joe', 'PHP', 'Ruby']
Arr::forget()
Arr::forget 方法使用「.」号从嵌套数组中移除给定键值对:
use Illuminate\Support\Arr;
$array = ['products' => ['desk' => ['price' => 100]]];
Arr::forget($array, 'products.desk');
// ['products' => []]
Arr::get()
Arr::get
方法使用「.」号从嵌套数组中获取值:
use Illuminate\Support\Arr;
$array = ['products' => ['desk' => ['price' => 100]]];
$price = Arr::get($array, 'products.desk.price');
// 100
Arr::get
方法还接收一个默认值,如果指定键不存在的话则返回该默认值:
use Illuminate\Support\Arr;
$discount = Arr::get($array, 'products.desk.discount', 0);
// 0
Arr::has()
Arr::has
方法使用「.」检查给定数据项是否在数组中存在:
use Illuminate\Support\Arr;
$array = ['product' => ['name' => 'Desk', 'price' => 100]];
$contains = Arr::has($array, 'product.name');
// true
$contains = Arr::has($array, ['product.price', 'product.discount']);
// false
Arr::hasAny
Arr::hasAny
方法检查给定集合中的任意项(通过 . 访问)是否在数组中存在:
use Illuminate\Support\Arr;
$array = ['product' => ['name' => 'Desk', 'price' => 100]];
$contains = Arr::hasAny($array, 'product.name');
// true
$contains = Arr::hasAny($array, ['product.name', 'product.discount']);
// true
$contains = Arr::hasAny($array, ['category', 'product.discount']);
// false
Arr::isAssoc()
Arr::isAssoc
方法会在给定数组是关联数组时返回 true,如果一个数组没有包含从0开始的数字序列键,就被认为是「关联数组」:
use Illuminate\Support\Arr;
$isAssoc = Arr::isAssoc(['product' => ['name' => 'Desk', 'price' => 100]]);
// true
$isAssoc = Arr::isAssoc([1, 2, 3]);
// false
Arr::last()
Arr::last
方法返回通过过滤数组的最后一个元素:
use Illuminate\Support\Arr;
$array = [100, 200, 300, 110];
$last = Arr::last($array, function ($value, $key) {
return $value >= 150;
});
// 300
我们可以传递一个默认值作为第三个参数到该方法,如果没有值通过真理测试的话该默认值被返回:
use Illuminate\Support\Arr;
$last = Arr::last($array, $callback, $default);
Arr::only()
Arr::only 方法只从给定数组中返回指定键值对:
use Illuminate\Support\Arr;
$array = ['name' => 'Desk', 'price' => 100, 'orders' => 10];
$slice = Arr::only($array, ['name', 'price']);
// ['name' => 'Desk', 'price' => 100]
Arr::pluck()
Arr::pluck
方法从数组中返回给定键对应的键值对列表:
use Illuminate\Support\Arr;
$array = [
['developer' => ['id' => 1, 'name' => 'Taylor']],
['developer' => ['id' => 2, 'name' => 'Abigail']],
];
$names = Arr::pluck($array, 'developer.name');
// ['Taylor', 'Abigail']
我们还可以指定返回结果的键:
use Illuminate\Support\Arr;
$names = Arr::pluck($array, 'developer.name', 'developer.id');
// [1 => 'Taylor', 2 => 'Abigail']
Arr::prepend()
Arr::prepend
方法将数据项推入数组开头:
use Illuminate\Support\Arr;
$array = ['one', 'two', 'three', 'four'];
$array = Arr::prepend($array, 'zero');
// ['zero', 'one', 'two', 'three', 'four']
如果需要的话还可以指定用于该值的键:
use Illuminate\Support\Arr;
$array = ['price' => 100];
$array = Arr::prepend($array, 'Desk', 'name');
// ['name' => 'Desk', 'price' => 100]
Arr::pull()
Arr::pull
方法从数组中返回并移除键值对:
use Illuminate\Support\Arr;
$array = ['name' => 'Desk', 'price' => 100];
$name = Arr::pull($array, 'name');
// $name: Desk
// $array: ['price' => 100]
我们还可以传递默认值作为第三个参数到该方法,如果指定键不存在的话返回该值:
use Illuminate\Support\Arr;
$value = Arr::pull($array, $key, $default);
Arr::query()
Arr::query
方法会转化数组为查询字符串:
use Illuminate\Support\Arr;
$array = ['name' => 'Taylor', 'order' => ['column' => 'created_at', 'direction' => 'desc']];
Arr::query($array);
// name=Taylor&order[column]=created_at&order[direction]=desc
Arr::random()
Arr::random
方法从数组中返回随机值:
use Illuminate\Support\Arr;
$array = [1, 2, 3, 4, 5];
$random = Arr::random($array);
// 4 - (retrieved randomly)
还可以指定返回的数据项数目作为可选的第二个参数,需要注意的是提供这个参数会返回一个数组,即使只返回一个数据项:
use Illuminate\Support\Arr;
$items = Arr::random($array, 2);
// [2, 5] - (retrieved randomly)
Arr::set()
Arr::set
方法用于在嵌套数组中使用「.」号设置值:
use Illuminate\Support\Arr;
$array = ['products' => ['desk' => ['price' => 100]]];
Arr::set($array, 'products.desk.price', 200);
// ['products' => ['desk' => ['price' => 200]]]
Arr::shuffle()
Arr::shuffle
方法会随机打乱数组中元素的排序:
use Illuminate\Support\Arr;
$array = Arr::shuffle([1, 2, 3, 4, 5]);
// [3, 2, 5, 1, 4] - (generated randomly)
Arr::sort()
Arr::sort
方法通过值对数组进行排序:
use Illuminate\Support\Arr;
$array = ['Desk', 'Table', 'Chair'];
$sorted = Arr::sort($array);
// ['Chair', 'Desk', 'Table']
还可以通过给定闭包的结果对数组进行排序:
use Illuminate\Support\Arr;
$array = [
['name' => 'Desk'],
['name' => 'Table'],
['name' => 'Chair'],
];
$sorted = array_values(Arr::sort($array, function ($value) {
return $value['name'];
}));
/*
[
['name' => 'Chair'],
['name' => 'Desk'],
['name' => 'Table'],
]
*/
Arr::sortRecursive()
Arr::sortRecursive
方法使用 sort 函数对索引数组、ksort 函数对关联数组进行递归排序:
use Illuminate\Support\Arr;
$array = [
['Roman', 'Taylor', 'Li'],
['PHP', 'Ruby', 'JavaScript'],
['one' => 1, 'two' => 2, 'three' => 3],
];
$sorted = Arr::sortRecursive($array);
/*
[
['JavaScript', 'PHP', 'Ruby'],
['one' => 1, 'three' => 3, 'two' => 2],
['Li', 'Roman', 'Taylor'],
]
*/
Arr::where()
Arr::where
方法使用给定闭包对数组进行过滤:
use Illuminate\Support\Arr;
$array = [100, '200', 300, '400', 500];
$filtered = Arr::where($array, function ($value, $key) {
return is_string($value);
});
// [1 => '200', 3 => '400']
Arr::wrap()
Arr::wrap
方法将给定值包裹到数组中,如果给定值已经是数组则保持不变:
use Illuminate\Support\Arr;
$string = 'Laravel';
$array = Arr::wrap($string);
// ['Laravel']
如果给定值是空的,则返回一个空数组:
use Illuminate\Support\Arr;
$nothing = null;
$array = Arr::wrap($nothing);
// []
data_fill()
data_fill
函数使用「.」号以嵌套数组或对象的方式设置缺失值:
$data = ['products' => ['desk' => ['price' => 100]]];
data_fill($data, 'products.desk.price', 200);
// ['products' => ['desk' => ['price' => 100]]]
data_fill($data, 'products.desk.discount', 10);
// ['products' => ['desk' => ['price' => 100, 'discount' => 10]]]
该函数还接收 *
号作为通配符并填充相应目标:
$data = [
'products' => [
['name' => 'Desk 1', 'price' => 100],
['name' => 'Desk 2'],
],
];
data_fill($data, 'products.*.price', 200);
/*
[
'products' => [
['name' => 'Desk 1', 'price' => 100],
['name' => 'Desk 2', 'price' => 200],
],
]
*/
data_get()
data_get
函数使用「.」号从嵌套数组或对象中获取值:
$data = ['products' => ['desk' => ['price' => 100]]];
$price = data_get($data, 'products.desk.price');
// 100
data_get 函数还接收默认值,以便指定键不存在的情况下返回:
$discount = data_get($data, 'products.desk.discount', 0);
// 0
该函数还可以接收通配符 *
,用于指向数组或对象的任意键:
$data = [
'product-one' => ['name' => 'Desk 1', 'price' => 100],
'product-two' => ['name' => 'Desk 2', 'price' => 150],
];
data_get($data, '*.name');
// ['Desk 1', 'Desk 2'];
data_set()
data_set
函数使用「.」号设置嵌套数组或对象的值:
$data = ['products' => ['desk' => ['price' => 100]]];
data_set($data, 'products.desk.price', 200);
// ['products' => ['desk' => ['price' => 200]]]
该函数还接收通配符然后设置相应的目标值:
$data = [
'products' => [
['name' => 'Desk 1', 'price' => 100],
['name' => 'Desk 2', 'price' => 150],
],
];
data_set($data, 'products.*.price', 200);
/*
[
'products' => [
['name' => 'Desk 1', 'price' => 200],
['name' => 'Desk 2', 'price' => 200],
],
]
*/
默认情况下,任意已存在的值都会被覆盖,如果你想要只设置不存在的值,可以传递 false 作为第三个参数:
$data = ['products' => ['desk' => ['price' => 100]]];
data_set($data, 'products.desk.price', 200, false);
// ['products' => ['desk' => ['price' => 100]]]
head()
head 函数只是简单返回给定数组的第一个元素:
$array = [100, 200, 300];
$first = head($array);
// 100
last()
last
函数返回给定数组的最后一个元素:
$array = [100, 200, 300];
$last = last($array);
// 300