composer require flow-php/etl ~0.32.0 
Read from various data sources.
Shape and optimize for your needs.
Store and secure in one of many available data sinks.
Type validation checks if a value matches the expected type without throwing exceptions. The isValid() method returns true if the value conforms to the type, false otherwise. This is useful for conditional logic, filtering data, or performing pre-flight checks before processing.
Unlike assertions, validation never throws - it's designed for control flow decisions rather than enforcing contracts.
Validate any value (mixed type). Always returns true for any PHP value.
<?php
declare(strict_types=1);
use function Flow\Types\DSL\type_mixed;
require __DIR__ . '/vendor/autoload.php';
echo 'Is string valid? ' . (type_mixed()->isValid('hello') ? 'yes' : 'no') . "\n";
echo 'Is int valid? ' . (type_mixed()->isValid(42) ? 'yes' : 'no') . "\n";
echo 'Is null valid? ' . (type_mixed()->isValid(null) ? 'yes' : 'no') . "\n";
echo 'Is array valid? ' . (type_mixed()->isValid([1, 2, 3]) ? 'yes' : 'no') . "\n";
echo 'Is object valid? ' . (type_mixed()->isValid(new \stdClass()) ? 'yes' : 'no') . "\n";
