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@ 2016-05-02T09:36:04Z

<?php

class RewindableGenerator implements Iterator
{
    private $rewound;
    private $iteratorConstructor;
    private $iterator;
    
    function __construct(callable $iteratorConstructor){
        $this->iteratorConstructor = $iteratorConstructor;
        $this->rewind();
    }
    
    function rewind(){
        if(!$this->rewound){
            $this->iterator = ($this->iteratorConstructor)();
            $this->rewound = true;
        }
    }
    
    function next(){
        $this->iterator->next();
        $this->rewound = false;
    }
    
    function valid(){
        return $this->iterator->valid();
    }
    
    function key(){
        return $this->iterator->key();
    }
    
    function current(){
        return $this->iterator->current();
    }
}


function test(){
    yield 0;
    yield 1;
    yield 2;
    yield 3;
    yield 4;
}

function baz(){
    return new RewindableGenerator('test');
}

$gen = baz();

echo $gen->current() . " 0\n";
$gen->next();
echo $gen->current() . " 1\n";
$gen->next();
echo $gen->current() . " 2\n";
$gen->next();
echo $gen->current() . " 3\n";

echo "rewind\n";
$gen->rewind();
echo $gen->current() . " 0\n";
$gen->next();
echo $gen->current() . " 1\n";
$gen->next();
echo $gen->current() . " 2\n";

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of RewindableGenerator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/YS6Ze on line 34 Deprecated: Return type of RewindableGenerator::next() should either be compatible with Iterator::next(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/YS6Ze on line 21 Deprecated: Return type of RewindableGenerator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/YS6Ze on line 30 Deprecated: Return type of RewindableGenerator::valid() should either be compatible with Iterator::valid(): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/YS6Ze on line 26 Deprecated: Return type of RewindableGenerator::rewind() should either be compatible with Iterator::rewind(): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/YS6Ze on line 14 0 0 1 1 2 2 3 3 rewind 0 0 1 1 2 2

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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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