Online PHP editor | rfc for fmrAk

@ 2020-08-04T09:49:03Z

<?php
declare(strict_types=1);

final class PathAsKeyDecorator implements \Iterator
{
    private RecursiveIteratorIterator $inner;

    public function __construct(RecursiveIteratorIterator $inner)
    {
        $this->inner = $inner;
    }

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

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

    public function key()
    {
        $path = [];
        for ($i = 0, $depth = $this->inner->getDepth(); $i <= $depth; $i++) {
            $path[] = $this->inner->getSubIterator($i)->key();
        }

        return $path;
    }

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

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

$input = [
    'steve'  => [
        'id' => [
            '#text' => 1,
        ],
    ],
    'albert' => [
        'id' => [
            '#text' => 2,
        ],
    ],
    'john'   => [
        'profil' => [
            'id' => [
                '#text' => 3,
            ],
        ],
    ],
];

// this is the filter function that should be customized given your requirements
// or create a factory function which produces these types of filter functions
$filter = static function ($current, array $path): bool {
    // with help from the PathAsKeyDecorator
    // we can decide on the path to the current value
    return ['id', '#text'] === array_slice($path, -2)
        // and the current value
        && 2 === $current;
};


// configure the iterator
$it = new CallbackFilterIterator(
    new PathAsKeyDecorator(new RecursiveIteratorIterator(new RecursiveArrayIterator($input))),
    $filter,
);

// traverse the iterator
foreach ($it as $path => $val) {
    print_r([
        'path' => $path,
        'val'  => $val
    ]);
}

Output for git.master, git.master_jit, rfc.property-hooks: Deprecated: Return type of PathAsKeyDecorator::current() should either be compatible with Iterator::current(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/fmrAk on line 13 Deprecated: Return type of PathAsKeyDecorator::key() should either be compatible with Iterator::key(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /in/fmrAk on line 23 Array ( [path] => Array ( [0] => albert [1] => id [2] => #text ) [val] => 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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