Laravel 中 Arr 数组处理类

Illuminate\Support\Arr是一个数组助手类

1、Arr::add()

  • 如果给定的键在数组中不存在或给定的键的值被设置为 null ,那么 Arr::add 函数将会把给定的键值对添加到数组中:
    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]

2、Arr::collapse()

  • 将多个数组合并为一个数组:
    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]

3、Arr::dot()

  • 将多维数组中所有的键平铺到一维数组中,新数组使用「.」符号表示层级包含关系:
    use Illuminate\Support\Arr;
    $array = ['products' => ['desk' => ['price' => 100]]];
    $flattened = Arr::dot($array);
    // ['products.desk.price' => 100]

4、Arr::except()

  • 函数从数组中删除指定的键值对:
    use Illuminate\Support\Arr;
    $array = ['name' => 'Desk', 'price' => 100];
    $filtered = Arr::except($array, ['price']);
    // ['name' => 'Desk']

5、Arr::first()

  • 函数返回数组中满足指定条件的第一个元素:
    use Illuminate\Support\Arr;
    $array = [100, 200, 300];
    $first = Arr::first($array, function ($value, $key) {
    return $value >= 150;
    });
    // 200
  • 将默认值作为第三个参数传递给该方法,如果没有值满足条件,则返回该默认值:
    use Illuminate\Support\Arr;
    $first = Arr::first($array, $callback, $default);

6、Arr::only()

  • 函数只返回给定数组中指定的键值对:
    use Illuminate\Support\Arr;
    $array = ['name' => 'Desk', 'price' => 100, 'orders' => 10];
    $slice = Arr::only($array, ['name', 'price']);
    // ['name' => 'Desk', 'price' => 100]

7、Arr::pluck()

  • 函数从数组中检索给定键的所有值:
    use Illuminate\Support\Arr;
    $array = [
    ['developer' => ['id' => 1, 'name' => 'Taylor']],
    ['developer' => ['id' => 2, 'name' => 'Abigail']],
    ];
    $names = Arr::pluck($array, 'developer.name');
    // ['Taylor', 'Abigail']
    你也可以指定结果的键:
    use Illuminate\Support\Arr;
    $names = Arr::pluck($array, 'developer.name', 'developer.id');
    // [1 => 'Taylor', 2 => 'Abigail']
    还可以给整个数组重新定义键
    use Illuminate\Support\Arr;
    $names = Arr::pluck($array,null, 'developer.id');
    //  ['1'=>['developer' => ['id' => 1, 'name' => 'Taylor']],'2'=>['developer' => ['id' => 2, 'name' => 'Abigail']]];

8、data_get()

  • 函数使用「.」符号从多维数组或对象中根据指定键检索值:
    $data = ['products' => ['desk' => ['price' => 100]]];
    $price = data_get($data, 'products.desk.price');
    // 100
    也接受一个默认值,如果没有找到指定的键,将返回默认值
    $discount = data_get($data, 'products.desk.discount', 0);
    // 0
    也可以使用 「*」 作为通配符匹配键名
    $data = [
    'product-one' => ['name' => 'Desk 1', 'price' => 100],
    'product-two' => ['name' => 'Desk 2', 'price' => 150],
    ];
    data_get($data, '*.name');
    // ['Desk 1', 'Desk 2'];

9、data_set()

  • 函数使用「.」符号给多维数组或对象赋值:
$data = ['products' => ['desk' => ['price' => 100]]];
data_set($data, 'products.desk.price', 200);
// ['products' => ['desk' => ['price' => 200]]]
这个函数也支持使用「*」作为通配符给相应键名赋值:
$data = [
 'products' => [ ['name' => 'Desk 1', 'price' => 100], ['name' => 'Desk 2', 'price' => 150], ],];
data_set($data, 'products.*.price', 200);
/*
[
 'products' => [ ['name' => 'Desk 1', 'price' => 200], ['name' => 'Desk 2', 'price' => 200], ],]
*/
通常情况下,已存在的值将会被覆盖。如果只是希望设置一个目前不存在的值,你可以增加一个 false 作为函数的第四个参数:
$data = ['products' => ['desk' => ['price' => 100]]];
data_set($data, 'products.desk.price', 200, false);
// ['products' => ['desk' => ['price' => 100]]]

Arr 数组处理类解释

<?php

namespace Illuminate\Support;

use ArrayAccess;
use Illuminate\Support\Traits\Macroable;
use InvalidArgumentException;

class Arr
{
    use Macroable;

    /**
     * Determine whether the given value is array accessible.
     *
     * @param  mixed  $value
     * @return bool
     */
    //验证这个给定的值是否是可获取的, 如数组或者继承ArrayAccess的对象
    public static function accessible($value)
    {
        return is_array($value) || $value instanceof ArrayAccess;
    }

    /**
     * Add an element to an array using "dot" notation if it doesn't exist.
     *
     * @param  array   $array
     * @param  string  $key
     * @param  mixed   $value
     * @return array
     */
    // 对数组添加一个元素, 如果不存在的话,最后返回这个数组
    public static function add($array, $key, $value)
    {
        if (is_null(static::get($array, $key))) {
            static::set($array, $key, $value);
        }

        return $array;
    }

    /**
     * Collapse an array of arrays into a single array.
     *
     * @param  array  $array
     * @return array
     */
    //对二维数组进行折叠为乐一维数组
    public static function collapse($array)
    {
        $results = [];

        foreach ($array as $values) {
            if ($values instanceof Collection) {
                $values = $values->all();
            } elseif (! is_array($values)) {
                continue;
            }

            $results[] = $values;
        }

        return array_merge([], ...$results);
    }

    /**
     * Cross join the given arrays, returning all possible permutations.
     *
     * @param  array  ...$arrays
     * @return array
     */
    //对数组元素取交集, 参数必须是数组
    public static function crossJoin(...$arrays)
    {
        $results = [[]];

        foreach ($arrays as $index => $array) {
            $append = [];

            foreach ($results as $product) {
                foreach ($array as $item) {
                    $product[$index] = $item;

                    $append[] = $product;
                }
            }

            $results = $append;
        }

        return $results;
    }

    /**
     * Divide an array into two arrays. One with keys and the other with values.
     *
     * @param  array  $array
     * @return array
     */
    //获取数组的键和值, 分别作为数组
    public static function divide($array)
    {
        return [array_keys($array), array_values($array)];
    }

    /**
     * Flatten a multi-dimensional associative array with dots.
     *
     * @param  array   $array
     * @param  string  $prepend
     * @return array
     */
    //将多维数组使用点构建成键, 作为一个数组返回
    public static function dot($array, $prepend = '')
    {
        $results = [];

        foreach ($array as $key => $value) {
            if (is_array($value) && ! empty($value)) {
                $results = array_merge($results, static::dot($value, $prepend.$key.'.'));
            } else {
                $results[$prepend.$key] = $value;
            }
        }

        return $results;
    }

    /**
     * Get all of the given array except for a specified array of keys.
     *
     * @param  array  $array
     * @param  array|string  $keys
     * @return array
     */
    //获取数组除了$keys之外的元素
    public static function except($array, $keys)
    {
        static::forget($array, $keys);

        return $array;
    }

    /**
     * Determine if the given key exists in the provided array.
     *
     * @param  \ArrayAccess|array  $array
     * @param  string|int  $key
     * @return bool
     */
    //判断一个key是否在数组中存在
    public static function exists($array, $key)
    {
        if ($array instanceof ArrayAccess) {
            return $array->offsetExists($key);
        }

        return array_key_exists($key, $array);
    }

    /**
     * Return the first element in an array passing a given truth test.
     *
     * @param  array  $array
     * @param  callable|null  $callback
     * @param  mixed  $default
     * @return mixed
     */
    /**
     * 返回数组中经过测试成功的第一个元素
     * 1. 如果没有测试函数, 那么返回数组第一个元素
     * 2. 如果没有测试函数,也没有数组元素,则返回默认值
     * 3. 如果有测试函数,则返回第一个测试成功的元素
     * 4. 如果有测试函数,但是测试都是不通过,则返回默认值
     */
    public static function first($array, callable $callback = null, $default = null)
    {
        if (is_null($callback)) {
            if (empty($array)) {
                return value($default);
            }

            foreach ($array as $item) {
                return $item;
            }
        }

        foreach ($array as $key => $value) {
            if ($callback($value, $key)) {
                return $value;
            }
        }

        return value($default);
    }

    /**
     * Return the last element in an array passing a given truth test.
     *
     * @param  array  $array
     * @param  callable|null  $callback
     * @param  mixed  $default
     * @return mixed
     */
    //与上一个函数类似
    public static function last($array, callable $callback = null, $default = null)
    {
        if (is_null($callback)) {
            return empty($array) ? value($default) : end($array);
        }

        return static::first(array_reverse($array, true), $callback, $default);
    }

    /**
     * Flatten a multi-dimensional array into a single level.
     *
     * @param  array  $array
     * @param  int  $depth
     * @return array
     */
    // 将一个多维数组变成为单层, 指定过滤数组的层级
    public static function flatten($array, $depth = INF)
    {
        $result = [];

        foreach ($array as $item) {
            $item = $item instanceof Collection ? $item->all() : $item;

            if (! is_array($item)) {
                $result[] = $item;
            } else {
                $values = $depth === 1
                    ? array_values($item)
                    : static::flatten($item, $depth - 1);

                foreach ($values as $value) {
                    $result[] = $value;
                }
            }
        }

        return $result;
    }

    /**
     * Remove one or many array items from a given array using "dot" notation.
     *
     * @param  array  $array
     * @param  array|string  $keys
     * @return void
     */
    //对传递的数组进行移除指定的keys
    public static function forget(&$array, $keys)
    {
        $original = &$array;

        $keys = (array) $keys;

        if (count($keys) === 0) {
            return;
        }

        foreach ($keys as $key) {
            // if the exact key exists in the top-level, remove it
            if (static::exists($array, $key)) {
                unset($array[$key]);

                continue;
            }

            $parts = explode('.', $key);

            // clean up before each pass
            $array = &$original;

            while (count($parts) > 1) {
                $part = array_shift($parts);

                if (isset($array[$part]) && is_array($array[$part])) {
                    $array = &$array[$part];
                } else {
                    continue 2;
                }
            }

            unset($array[array_shift($parts)]);
        }
    }

    /**
     * Get an item from an array using "dot" notation.
     *
     * @param  \ArrayAccess|array  $array
     * @param  string|int  $key
     * @param  mixed   $default
     * @return mixed
     */
    //获取数组某个键值,不存在则返回默认值; 如果键不可访问,则返回数组
    public static function get($array, $key, $default = null)
    {
        if (! static::accessible($array)) {
            return value($default);
        }

        if (is_null($key)) {
            return $array;
        }

        if (static::exists($array, $key)) {
            return $array[$key];
        }

        if (strpos($key, '.') === false) {
            return $array[$key] ?? value($default);
        }

        foreach (explode('.', $key) as $segment) {
            if (static::accessible($array) && static::exists($array, $segment)) {
                $array = $array[$segment];
            } else {
                return value($default);
            }
        }

        return $array;
    }

    /**
     * Check if an item or items exist in an array using "dot" notation.
     *
     * @param  \ArrayAccess|array  $array
     * @param  string|array  $keys
     * @return bool
     */
    //判断数组中是否有存在指定的keys
    public static function has($array, $keys)
    {
        $keys = (array) $keys;

        if (! $array || $keys === []) {
            return false;
        }

        foreach ($keys as $key) {
            $subKeyArray = $array;

            if (static::exists($array, $key)) {
                continue;
            }

            foreach (explode('.', $key) as $segment) {
                if (static::accessible($subKeyArray) && static::exists($subKeyArray, $segment)) {
                    $subKeyArray = $subKeyArray[$segment];
                } else {
                    return false;
                }
            }
        }

        return true;
    }

    /**
     * Determines if an array is associative.
     *
     * An array is "associative" if it doesn't have sequential numerical keys beginning with zero.
     *
     * @param  array  $array
     * @return bool
     */
    //是否是一个有键的数组
    public static function isAssoc(array $array)
    {
        $keys = array_keys($array);

        return array_keys($keys) !== $keys;
    }

    /**
     * Get a subset of the items from the given array.
     *
     * @param  array  $array
     * @param  array|string  $keys
     * @return array
     */
    //获取数组中指定的keys
    public static function only($array, $keys)
    {
        return array_intersect_key($array, array_flip((array) $keys));
    }

    /**
     * Pluck an array of values from an array.
     *
     * @param  array  $array
     * @param  string|array  $value
     * @param  string|array|null  $key
     * @return array
     */
    public static function pluck($array, $value, $key = null)
    {
        $results = [];

        [$value, $key] = static::explodePluckParameters($value, $key);

        foreach ($array as $item) {
            $itemValue = data_get($item, $value);

            // If the key is "null", we will just append the value to the array and keep
            // looping. Otherwise we will key the array using the value of the key we
            // received from the developer. Then we'll return the final array form.
            if (is_null($key)) {
                $results[] = $itemValue;
            } else {
                $itemKey = data_get($item, $key);

                if (is_object($itemKey) && method_exists($itemKey, '__toString')) {
                    $itemKey = (string) $itemKey;
                }

                $results[$itemKey] = $itemValue;
            }
        }

        return $results;
    }

    /**
     * Explode the "value" and "key" arguments passed to "pluck".
     *
     * @param  string|array  $value
     * @param  string|array|null  $key
     * @return array
     */
    protected static function explodePluckParameters($value, $key)
    {
        $value = is_string($value) ? explode('.', $value) : $value;

        $key = is_null($key) || is_array($key) ? $key : explode('.', $key);

        return [$value, $key];
    }

    /**
     * Push an item onto the beginning of an array.
     *
     * @param  array  $array
     * @param  mixed  $value
     * @param  mixed  $key
     * @return array
     */
    //在数组开头添加值
    public static function prepend($array, $value, $key = null)
    {
        if (is_null($key)) {
            array_unshift($array, $value);
        } else {
            $array = [$key => $value] + $array;
        }

        return $array;
    }

    /**
     * Get a value from the array, and remove it.
     *
     * @param  array   $array
     * @param  string  $key
     * @param  mixed   $default
     * @return mixed
     */
    //从数组中获取值, 然后从这个数组中删除它
    public static function pull(&$array, $key, $default = null)
    {
        $value = static::get($array, $key, $default);

        static::forget($array, $key);

        return $value;
    }

    /**
     * Get one or a specified number of random values from an array.
     *
     * @param  array  $array
     * @param  int|null  $number
     * @return mixed
     *
     * @throws \InvalidArgumentException
     */
    //随机的从数组中获取几个值
    public static function random($array, $number = null)
    {
        $requested = is_null($number) ? 1 : $number;

        $count = count($array);

        if ($requested > $count) {
            throw new InvalidArgumentException(
                "You requested {$requested} items, but there are only {$count} items available."
            );
        }

        if (is_null($number)) {
            return $array[array_rand($array)];
        }

        if ((int) $number === 0) {
            return [];
        }

        $keys = array_rand($array, $number);

        $results = [];

        foreach ((array) $keys as $key) {
            $results[] = $array[$key];
        }

        return $results;
    }

    /**
     * Set an array item to a given value using "dot" notation.
     *
     * If no key is given to the method, the entire array will be replaced.
     *
     * @param  array   $array
     * @param  string  $key
     * @param  mixed   $value
     * @return array
     */
    //设置数组中一个值
    public static function set(&$array, $key, $value)
    {
        if (is_null($key)) {
            return $array = $value;
        }

        $keys = explode('.', $key);

        while (count($keys) > 1) {
            $key = array_shift($keys);

            // If the key doesn't exist at this depth, we will just create an empty array
            // to hold the next value, allowing us to create the arrays to hold final
            // values at the correct depth. Then we'll keep digging into the array.
            if (! isset($array[$key]) || ! is_array($array[$key])) {
                $array[$key] = [];
            }

            $array = &$array[$key];
        }

        $array[array_shift($keys)] = $value;

        return $array;
    }

    /**
     * Shuffle the given array and return the result.
     *
     * @param  array  $array
     * @param  int|null  $seed
     * @return array
     */
    //打乱数组,并且返回数组
    public static function shuffle($array, $seed = null)
    {
        if (is_null($seed)) {
            shuffle($array);
        } else {
            mt_srand($seed);
            shuffle($array);
            mt_srand();
        }

        return $array;
    }

    /**
     * Sort the array using the given callback or "dot" notation.
     *
     * @param  array  $array
     * @param  callable|string|null  $callback
     * @return array
     */
    //使用回调函数进行排序
    public static function sort($array, $callback = null)
    {
        return Collection::make($array)->sortBy($callback)->all();
    }

    /**
     * Recursively sort an array by keys and values.
     *
     * @param  array  $array
     * @return array
     */
    //递归的排序
    //如果有键,则通过键排序
    //否则通过值排序
    public static function sortRecursive($array)
    {
        foreach ($array as &$value) {
            if (is_array($value)) {
                $value = static::sortRecursive($value);
            }
        }

        if (static::isAssoc($array)) {
            ksort($array);
        } else {
            sort($array);
        }

        return $array;
    }

    /**
     * Convert the array into a query string.
     *
     * @param  array  $array
     * @return string
     */
    //构建URL的请求参数
    public static function query($array)
    {
        return http_build_query($array, null, '&', PHP_QUERY_RFC3986);
    }

    /**
     * Filter the array using the given callback.
     *
     * @param  array  $array
     * @param  callable  $callback
     * @return array
     */
    // 使用回调函数进行过滤
    public static function where($array, callable $callback)
    {
        return array_filter($array, $callback, ARRAY_FILTER_USE_BOTH);
    }

    /**
     * If the given value is not an array and not null, wrap it in one.
     *
     * @param  mixed  $value
     * @return array
     */
    //对value进行包装称为一个数组
    public static function wrap($value)
    {
        if (is_null($value)) {
            return [];
        }

        return is_array($value) ? $value : [$value];
    }
}

本作品采用《CC 协议》,转载必须注明作者和本文链接
《L05 电商实战》
从零开发一个电商项目,功能包括电商后台、商品 & SKU 管理、购物车、订单管理、支付宝支付、微信支付、订单退款流程、优惠券等
《L02 从零构建论坛系统》
以构建论坛项目 LaraBBS 为线索,展开对 Laravel 框架的全面学习。应用程序架构思路贴近 Laravel 框架的设计哲学。
讨论数量: 0
(= ̄ω ̄=)··· 暂无内容!

讨论应以学习和精进为目的。请勿发布不友善或者负能量的内容,与人为善,比聪明更重要!