在PHP 7中鍵入提示-對像數組




arrays oop (4)

再加上Steini的回答。

您可以創建一個ObjectNIterator類來管理您的ObjectN並實現Iterator: http://php.net/manual/en/class.iterator.php ://php.net/manual/en/class.iterator.php

從methodN,調用classMethodM,它返回一個填充的ObjectNIterator,然後將此數據傳遞給期望ObjectNIterator的methodO:

public function methodO(ObjectNIterator $objectNCollection)

也許我錯過了一些東西,但有沒有選項來定義該函數應該有參數或返回例如User對象的數組?

請考慮以下代碼:

<?php

class User
{
    protected $name;

    protected $age;

    /**
     * User constructor.
     *
     * @param $name
     */
    public function __construct(string $name, int $age)
    {
        $this->name = $name;
        $this->age = $age;
    }

    /**
     * @return mixed
     */
    public function getName() : string
    {
        return $this->name;
    }

    public function getAge() : int
    {
        return $this->age;
    }
}

function findUserByAge(int $age, array $users) : array
{
    $result = [];
    foreach ($users as $user) {
        if ($user->getAge() == $age) {
            if ($user->getName() == 'John') {
                // complicated code here
                $result[] = $user->getName(); // bug
            } else {
                $result[] = $user;
            }
        }
    }

    return $result;
}

$users = [
    new User('John', 15),
    new User('Daniel', 25),
    new User('Michael', 15),
];

$matches = findUserByAge(15, $users);

foreach ($matches as $user) {
    echo $user->getName() . ' '.$user->getAge() . "\n";
}

在PHP7中是否有任何選項告訴函數 findUserByAge 應該返回用戶數組? 我希望當添加類型提示時,它應該是可能的,但我沒有找到任何關於對像數組的類型提示的信息,所以可能它不包含在PHP 7中。如果它不包括在內,你有沒有任何線索為什麼它是添加類型提示時不包含?


在我們的代碼庫中,我們有集合的概念。 它們基於一個名為TypedArray的類,它基於ArrayObject。

function doFoo(array $_foos)
{
    return (function(Foo ...$_foos){ // Closure

    // Do whatever you want with the $_foos array

    })(...$_foos); //Main function's parameter $_foos unpacked
}

/**
 * @param $_foos Foo[] <- An array of type Foo
 */

一個示例用途。

class Foo{}

class NotFoo{}

class Bar{
    /**
     * @param $_foos Foo[]
     */
    public function doFoo(array $_foos, $_param2)
    {return (function(Foo ...$_foos) use($_param2){

        return $_param2;

    })(...$_foos);}
}

$myBar = new Bar();
$arrayOfFoo = array(new Foo(), new Foo(), new Foo());
$notArrayOfFoo = array(new Foo(), new NotFoo(), new Foo());

echo $myBar->doFoo($arrayOfFoo, 'Success');
// Success

echo $myBar->doFoo($notArrayOfFoo, 'Success');
// Uncaught TypeError: Argument 2 passed to Bar::{closure}() must be an instance of Foo, instance of NotFoo given...

您現在可以使用 PaymentChannelCollection 並確保您有一個PaymentChannels集合(例如)。

一些代碼可能會在我們的命名空間中調用異常。 我認為danielgsims / php-collections也有一個類型驗證器(我們最初使用的是這些集合,但是它們的靈活性存在問題 - 它們很好,只是不適合我們 - 所以無論如何也可以看看它們!)。


我給出了一般關於數組類型提示的通用答案。

我對所選答案進行了修改。 主要區別在於參數是一個數組而不是檢查類的許多實例。

class ArrayObject extends \ArrayObject
{
    /**
     * Clone a collection by cloning all items.
     */
    public function __clone()
    {
        foreach ($this as $key => $value) {
            $this[$key] = is_object($value) ? clone $value : $value;
        }
    }

    /**
     * Inserting the provided element at the index. If index is negative, it will be calculated from the end of the Array Object
     *
     * @param int $index
     * @param mixed $element
     */
    public function insert(int $index, $element)
    {
        $data = $this->getArrayCopy();
        if ($index < 0) {
            $index = $this->count() + $index;
        }

        $data = array_merge(array_slice($data, 0, $index, true), [$element], array_slice($data, $index, null, true));
        $this->exchangeArray($data);
    }

    /**
     * Remove a portion of the array and optionally replace it with something else.
     *
     * @see array_splice()
     *
     * @param int $offset
     * @param int|null $length
     * @param null $replacement
     *
     * @return static
     */
    public function splice(int $offset, int $length = null, $replacement = null)
    {
        $data = $this->getArrayCopy();

        // A null $length AND a null $replacement is not the same as supplying null to the call.
        if (is_null($length) && is_null($replacement)) {
            $result = array_splice($data, $offset);
        } else {
            $result = array_splice($data, $offset, $length, $replacement);
        }
        $this->exchangeArray($data);

        return new static($result);
    }

    /**
     * Adding a new value at the beginning of the collection
     *
     * @param mixed $value
     *
     * @return int Returns the new number of elements in the Array
     */
    public function unshift($value): int
    {
        $data = $this->getArrayCopy();
        $result = array_unshift($data, $value);
        $this->exchangeArray($data);

        return $result;
    }

    /**
     * Extract a slice of the array.
     *
     * @see array_slice()
     *
     * @param int $offset
     * @param int|null $length
     * @param bool $preserveKeys
     *
     * @return static
     */
    public function slice(int $offset, int $length = null, bool $preserveKeys = false)
    {
        return new static(array_slice($this->getArrayCopy(), $offset, $length, $preserveKeys));
    }

    /**
     * Sort an array.
     *
     * @see sort()
     *
     * @param int $sortFlags
     *
     * @return bool
     */
    public function sort($sortFlags = SORT_REGULAR)
    {
        $data = $this->getArrayCopy();
        $result = sort($data, $sortFlags);
        $this->exchangeArray($data);

        return $result;
    }

    /**
     * Apply a user supplied function to every member of an array
     *
     * @see array_walk
     *
     * @param callable $callback
     * @param mixed|null $userData
     *
     * @return bool Returns true on success, otherwise false
     *
     * @see array_walk()
     */
    public function walk($callback, $userData = null)
    {
        $data = $this->getArrayCopy();
        $result = array_walk($data, $callback, $userData);
        $this->exchangeArray($data);

        return $result;
    }

    /**
     * Chunks the object into ArrayObject containing
     *
     * @param int $size
     * @param bool $preserveKeys
     *
     * @return ArrayObject
     */
    public function chunk(int $size, bool $preserveKeys = false): ArrayObject
    {
        $data = $this->getArrayCopy();
        $result = array_chunk($data, $size, $preserveKeys);

        return new ArrayObject($result);
    }

    /**
     * @see array_column
     *
     * @param mixed $columnKey
     *
     * @return array
     */
    public function column($columnKey): array
    {
        $data = $this->getArrayCopy();
        $result = array_column($data, $columnKey);

        return $result;
    }

    /**
     * @param callable $mapper Will be called as $mapper(mixed $item)
     *
     * @return ArrayObject A collection of the results of $mapper(mixed $item)
     */
    public function map(callable $mapper): ArrayObject
    {
        $data = $this->getArrayCopy();
        $result = array_map($mapper, $data);

        return new self($result);
    }

    /**
     * Applies the callback function $callable to each item in the collection.
     *
     * @param callable $callable
     */
    public function each(callable $callable)
    {
        foreach ($this as &$item) {
            $callable($item);
        }
        unset($item);
    }

    /**
     * Returns the item in the collection at $index.
     *
     * @param int $index
     *
     * @return mixed
     *
     * @throws InvalidArgumentException
     * @throws OutOfRangeException
     */
    public function at(int $index)
    {
        $this->validateIndex($index);

        return $this[$index];
    }

    /**
     * Validates a number to be used as an index
     *
     * @param int $index The number to be validated as an index
     *
     * @throws OutOfRangeException
     * @throws InvalidArgumentException
     */
    private function validateIndex(int $index)
    {
        $exists = $this->indexExists($index);

        if (!$exists) {
            throw new OutOfRangeException('Index out of bounds of collection');
        }
    }

    /**
     * Returns true if $index is within the collection's range and returns false
     * if it is not.
     *
     * @param int $index
     *
     * @return bool
     *
     * @throws InvalidArgumentException
     */
    public function indexExists(int $index)
    {
        if ($index < 0) {
            throw new InvalidArgumentException('Index must be a non-negative integer');
        }

        return $index < $this->count();
    }

    /**
     * Finding the first element in the Array, for which $callback returns true
     *
     * @param callable $callback
     *
     * @return mixed Element Found in the Array or null
     */
    public function find(callable $callback)
    {
        foreach ($this as $element) {
            if ($callback($element)) {
                return $element;
            }
        }

        return null;
    }

    /**
     * Filtering the array by retrieving only these elements for which callback returns true
     *
     * @param callable $callback
     * @param int $flag Use ARRAY_FILTER_USE_KEY to pass key as the only argument to $callback instead of value.
     *                  Use ARRAY_FILTER_USE_BOTH pass both value and key as arguments to $callback instead of value.
     *
     * @return static
     *
     * @see array_filter
     */
    public function filter(callable $callback, int $flag = 0)
    {
        $data = $this->getArrayCopy();
        $result = array_filter($data, $callback, $flag);

        return new static($result);
    }

    /**
     * Reset the array pointer to the first element and return the element.
     *
     * @return mixed
     *
     * @throws \OutOfBoundsException
     */
    public function first()
    {
        if ($this->count() === 0) {
            throw new \OutOfBoundsException('Cannot get first element of empty Collection');
        }

        return reset($this);
    }

    /**
     * Reset the array pointer to the last element and return the element.
     *
     * @return mixed
     *
     * @throws \OutOfBoundsException
     */
    public function last()
    {
        if ($this->count() === 0) {
            throw new \OutOfBoundsException('Cannot get last element of empty Collection');
        }

        return end($this);
    }

    /**
     * Apply a user supplied function to every member of an array
     *
     * @see array_reverse
     *
     * @param bool $preserveKeys
     *
     * @return static
     */
    public function reverse(bool $preserveKeys = false)
    {
        return new static(array_reverse($this->getArrayCopy(), $preserveKeys));
    }

    public function keys(): array
    {
        return array_keys($this->getArrayCopy());
    }

    /**
     * Use a user supplied callback to reduce the array to a single member and return it.
     *
     * @param callable $callback
     * @param mixed|null $initial
     *
     * @return mixed
     */
    public function reduce(callable $callback, $initial = null)
    {
        return array_reduce($this->getArrayCopy(), $callback, $initial);
    }
}

它看起來有點模糊,但很容易理解。 不是總是在每次調用時手動解包數組,而是調用函數中的閉包,並將數組解壓縮為參數。

/**
 * Class TypedArray
 *
 * This is a typed array
 *
 * By enforcing the type, you can guarantee that the content is safe to simply iterate and call methods on.
 */
abstract class AbstractTypedArray extends ArrayObject
{
    use TypeValidator;

    /**
     * Define the class that will be used for all items in the array.
     * To be defined in each sub-class.
     */
    const ARRAY_TYPE = null;

    /**
     * Array Type
     *
     * Once set, this ArrayObject will only accept instances of that type.
     *
     * @var string $arrayType
     */
    private $arrayType = null;

    /**
     * Constructor
     *
     * Store the required array type prior to parental construction.
     *
     * @param mixed[] $input Any data to preset the array to.
     * @param int $flags The flags to control the behaviour of the ArrayObject.
     * @param string $iteratorClass Specify the class that will be used for iteration of the ArrayObject object. ArrayIterator is the default class used.
     *
     * @throws InvalidArgumentException
     */
    public function __construct($input = [], $flags = 0, $iteratorClass = ArrayIterator::class)
    {
        // ARRAY_TYPE must be defined.
        if (empty(static::ARRAY_TYPE)) {
            throw new \RuntimeException(
                sprintf(
                    '%s::ARRAY_TYPE must be set to an allowable type.',
                    get_called_class()
                )
            );
        }

        // Validate that the ARRAY_TYPE is appropriate.
        try {
            $this->arrayType = $this->determineType(static::ARRAY_TYPE);
        } catch (\Collections\Exceptions\InvalidArgumentException $e) {
            throw new InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
        }

        // Validate that the input is an array or an object with an Traversable interface.
        if (!(is_array($input) || (is_object($input) && in_array(Traversable::class, class_implements($input))))) {
            throw new InvalidArgumentException('$input must be an array or an object that implements \Traversable.');
        }

        // Create an empty array.
        parent::__construct([], $flags, $iteratorClass);

        // Append each item so to validate it's type.
        foreach ($input as $key => $value) {
            $this[$key] = $value;
        }
    }

    /**
     * Adding a new value at the beginning of the collection
     *
     * @param mixed $value
     *
     * @return int Returns the new number of elements in the Array
     *
     * @throws InvalidArgumentException
     */
    public function unshift($value): int
    {
        try {
            $this->validateItem($value, $this->arrayType);
        } catch (\Collections\Exceptions\InvalidArgumentException $e) {
            throw new InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
        }

        return parent::unshift($value);
    }

    /**
     * Check the type and then store the value.
     *
     * @param mixed $offset The offset to store the value at or null to append the value.
     * @param mixed $value The value to store.
     *
     * @throws InvalidArgumentException
     */
    public function offsetSet($offset, $value)
    {
        try {
            $this->validateItem($value, $this->arrayType);
        } catch (\Collections\Exceptions\InvalidArgumentException $e) {
            throw new InvalidArgumentException($e->getMessage(), $e->getCode(), $e);
        }

        parent::offsetSet($offset, $value);
    }

    /**
     * Sort an array, taking into account objects being able to represent their sortable value.
     *
     * {@inheritdoc}
     */
    public function sort($sortFlags = SORT_REGULAR)
    {
        if (!in_array(SortableInterface::class, class_implements($this->arrayType))) {
            throw new \RuntimeException(
                sprintf(
                    "Cannot sort an array of '%s' as that class does not implement '%s'.",
                    $this->arrayType,
                    SortableInterface::class
                )
            );
        }
        // Get the data from
        $originalData = $this->getArrayCopy();
        $sortableData = array_map(
            function (SortableInterface $item) {
                return $item->getSortValue();
            },
            $originalData
        );

        $result = asort($sortableData, $sortFlags);

        $order = array_keys($sortableData);
        uksort(
            $originalData,
            function ($key1, $key2) use ($order) {
                return array_search($key1, $order) <=> array_search($key2, $order);
            }
        );

        $this->exchangeArray($originalData);

        return $result;
    }

    /**
     * {@inheritdoc}
     */
    public function filter(callable $callback, int $flag = 0)
    {
        if ($flag == ARRAY_FILTER_USE_KEY) {
            throw new InvalidArgumentException('Cannot filter solely by key. Use ARRAY_FILTER_USE_BOTH and amend your callback to receive $value and $key.');
        }

        return parent::filter($callback, $flag);
    }
}

我發現這很酷,因為您可以像使用具有ArrayOfType參數的任何其他語言函數一樣使用該函數。 另外,錯誤的處理方式與其他PHP類型提示錯誤的處理方式相同。 此外,您不會混淆將使用您的函數的其他程序員,並且必須解壓縮他們總是感覺有點hacky的數組。

您需要一些編程經驗才能理解其工作原理。 如果您需要多個參數,可以隨時將它們添加到閉包的“使用”部分。

您還可以使用doc註釋來公開類型提示。

class PaymentChannelCollection extends AbstractTypedArray
{
    const ARRAY_TYPE = PaymentChannel::class;
}

這是一個OO示例:

/**
 * @param $_foos Foo[]
 */
function doFoo(array $_foos)
{return (function(Foo ...$_foos){

    // Do whatever you want with the $_foos array

})(...$_foos);}

注意:這也適用於非對像類型(int,string等)


由於數組可以包含混合值,因此這是不可能的。

您必須為此目的使用對象/類。

您可以創建一個類來管理自己的列表數組(私有/受保護屬性),並拒絕添加其他值作為此問題的工作範圍(如果確實需要)。

但是,沒有負責任的程序員會破壞預期的模式,尤其是如果你正確地評論它。 無論如何,它將在程序中發生錯誤時被識別。

出院:

例如,您可以創建任何數組:

$myArray = array();

並添加一個數字:

$myArray[] = 1;

一個字符串:

$myArray[] = "abc123";

和一個對象

$myArray[] = new MyClass("some parameter", "and one more");

另外不要忘記,您可以擁有一個簡單的數組,一個多維堆疊數組以及可以具有混合模式的關聯數組。

很難找到一個解析器/ nottation來使所有版本都能使用強制我想的數組格式的表達式。

一方面很酷,但是在獎牌的另一方面你會失去一些混合數據的能力,這對於很多現有代碼和PHP必須提供的靈活性至關重要。

由於混合內容是我們不希望在PHP 7中遺漏的功能,因此無法鍵入提示數組的確切內容,因為您可以放入任何內容。





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