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@ 2017-02-21T09:25:23Z

<?php

function makeGen(array $array = []): Generator
{
    $item = current($array);
    yield $item;
    
    while($item = next($array)) {
        yield $item;
    }
}

class GeneratorIterator implements \Iterator
{
    private $genMaker;
    private $genArg;
    private $current;
    
    public function __construct(callable $genMaker, $arg)
    {
        $this->genMaker = $genMaker;
        $this->genArg = $arg;
        $this->current = $genMaker($arg);
    }
    
    public function current()
    {
        return $this->current->current();
    }
    
    public function key()
    {
        return $this->current->key();
    }
    
    public function rewind()
    {
        $this->current = call_user_func($this->genMaker, $this->genArg);
    }
    
    public function valid()
    {
        return $this->current->valid();
    }
    
    public function next()
    {
        $this->current->next();
    }
}

$genIterator = new GeneratorIterator('makeGen', [1,2,3]);

foreach($genIterator as $key => $value) {
    echo $key . ' -> ' . $value . "\n";
}
echo "\n";
foreach($genIterator as $key => $value) {
    echo $key . ' -> ' . $value . "\n";
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of GeneratorIterator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QOEAs on line 26 Deprecated: Return type of GeneratorIterator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QOEAs on line 46 Deprecated: Return type of GeneratorIterator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QOEAs on line 31 Deprecated: Return type of GeneratorIterator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QOEAs on line 41 Deprecated: Return type of GeneratorIterator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/QOEAs on line 36 0 -> 1 1 -> 2 2 -> 3 0 -> 1 1 -> 2 2 -> 3

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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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