$data = ['a' => '   Foo '];
print_r(prepare($data)->map('trim')->getData()); // ['a' => 'Foo']

$data = ['a' => 'foo', 'b' => 'bar'];
print_r(prepare($data)->apply(['a' => 'ucfirst'])->getData()); // ['a' => 'Foo', 'b' => 'bar']

$data = ['name' => '  foo ', 'age' => null, 'test' => false, 'quatz' => null];
print_r(prepare($data)->allowOnly(['name'])->getData()); // ['name' => '  foo ']

$data = [];
print_r(prepare($data)->applyDefaults(['name' => 'Foo'])->getData()); // ['name' => 'Foo']

$data = ['name' => '  foo ', 'age' => null, 'test' => false, 'quatz' => null];
print_r(prepare($data)->filter()->getData()); // ['name' => '  foo ']

$data = ['name' => '  foo ', 'age' => null, 'test' => false, 'quatz' => null];
print_r(prepare($data)->filterBy(function($v, $k) {
    return !empty($v);
})->getData()); // ['name' => '  foo ']

$rules = [
    'name' => 'string',
    'age'  => 'int(40, 100)',
    'foo'  => 'string(a+b+)',
    'bar'  => 'string(5)'
];

$data = ['name' => 'Foo', 'age' => 42, 'foo' => 'abb', 'bar' => 'quatz'];
print_r(prepare($data)->filterByRules($rules)->getData()); // ['name' => 'Foo', 'age' => 42, 'foo' => 'abb', 'bar' => 'quatz']

$pattern = [
    'name' => '#^\w+$#',
    'age'  => '#\d{2}#'
];

$data = ['name' => 'Foo', 'age' => 42];
print_r(prepare($data)->filterByPattern($pattern)->getData()); // ['name' => 'Foo', 'age' => 42]