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@ 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 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 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 )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: Array ( [path] => Array ( [0] => albert [1] => id [2] => #text ) [val] => 2 )
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Parse error: syntax error, unexpected 'RecursiveIteratorIterator' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/fmrAk on line 6
Process exited with code 255.

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