Online PHP editor | output for QOEAs

@ 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 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: 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
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: 0 -> 1 1 -> 2 2 -> 3 0 -> 1 1 -> 2 2 -> 3

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