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@ 2014-06-17T11:54:05Z

<?php

class TransformingIterator implements \Iterator
{
    /**
     * @var Iterator
     */
    private $inner;

    /**
     * @var callable
     */
    private $valTransformCallback;

    /**
     * @var callable
     */
    private $keyTransformCallback;

    /**
     * Constructor
     *
     * @param Iterator|array $inner
     * @param callable $valTransformCallback
     * @param callable $keyTransformCallback
     * @throws \InvalidArgumentException
     */
    public function __construct($inner, callable $valTransformCallback = null, callable $keyTransformCallback = null)
    {
        if ($inner instanceof \Iterator) {
            $this->inner = $inner;
        } else if (is_array($inner)) {
            $this->inner = new ArrayIterator($inner);
        } else {
            throw new \InvalidArgumentException('$inner must be an Iterator or an array');
        }

        $this->valTransformCallback = $valTransformCallback;
        $this->keyTransformCallback = $keyTransformCallback;
    }

    public function current()
    {
        return $this->valTransformCallback
            ? call_user_func($this->valTransformCallback, $this->inner->current())
            : $this->inner->current();
    }

    public function next()
    {
        $this->inner->next();
    }

    public function key()
    {
        return $this->valTransformCallback
            ? call_user_func($this->valTransformCallback, $this->inner->key())
            : $this->inner->key();
    }

    public function valid()
    {
        return $this->inner->valid();
    }

    public function rewind()
    {
        $this->inner->rewind();
    }
}

$it = new TransformingIterator([1,2,3], function ($value) { return $value + 1; });

foreach ($it as $val) {
    echo $val . "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of TransformingIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cddms on line 42 Deprecated: Return type of TransformingIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cddms on line 49 Deprecated: Return type of TransformingIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cddms on line 54 Deprecated: Return type of TransformingIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cddms on line 61 Deprecated: Return type of TransformingIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/Cddms on line 66 2 3 4

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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