respect-validation/docs/rules/Key.md

Key

• Key(mixed $key)
• Key(mixed $key, Validatable $rule)
• Key(mixed $key, Validatable $rule, bool $mandatory)

Validates an array key.

$dict = [
    'foo' => 'bar'
];

v::key('foo')->validate($dict); // true

You can also validate the key value itself:

v::key('foo', v::equals('bar'))->validate($dict); // true

Third parameter makes the key presence optional:

v::key('lorem', v::stringType(), false)->validate($dict); // true

The name of this validator is automatically set to the key name.

Categorization

• Arrays
• Nesting
• Structures

Changelog

Version	Description
0.3.9	Created

---

See also:

• ArrayVal
• Attribute
• Each
• KeyNested
• KeySet
• KeyValue