Collecting Batch Errors

Goal: validate every item and return all failures keyed by item.

use Maxiviper117\ResultFlow\Result;

$result = Result::mapCollectErrors($rows, function (array $row, string $key) {
    if (! filter_var($row['email'] ?? null, FILTER_VALIDATE_EMAIL)) {
        return Result::fail("Invalid email at {$key}");
    }

    return Result::ok([
        'email' => strtolower($row['email']),
    ]);
});

Why this pattern works

• every item is evaluated
• errors stay keyed
• partial success is not exposed on the failure branch

Variation

Use mapAll(...) if the first failure should stop processing immediately.