example.php

<?php

use Acme\JsonStreamParser;
use Bcn\Component\Json\Reader;

// Request is a PSR-7 request with a JSON body.
// The JSON body must be a list! Something like:
//
// [{...}, ...]
//
$stream = $request->getBody()->detach();

// Create the Reader instance.
// https://github.com/skolodyazhnyy/json-stream#json-reader
$reader = new Reader($stream);

// Wrap the reader in a parser.
$parser = new JsonStreamParser($reader);

// Calling parse() will start a generator.
foreach ($parser->parse() as $item) {
    print_r($item);
}

JsonStreamParser.php

<?php

namespace Acme;

use Bcn\Component\Json\Reader;
use Generator;

class JsonStreamParser
{
    /**
     * @var Reader
     */
    private $reader;

    public function __construct(Reader $reader)
    {
        $this->reader = $reader;
    }

    /**
     * Parse the JSON stream, yielding each item in the list.
     */
    public function parse(): Generator
    {
        // https://github.com/skolodyazhnyy/json-stream#json-reader
        $this->reader->enter(Reader::TYPE_ARRAY);

        while ($item = $this->reader->read()) {
            yield $item;
        }

        $this->reader->leave();
    }
}