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Undef.md

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Undef

  • Undef()

Validates if the given input is undefined. By undefined we consider null or an empty string ('').

We recommend you to check Comparing empty values for more details.

v::undef()->isValid(''); // true
v::undef()->isValid(null); // true

Other values similar to undefined values are considered defined:

v::undef()->isValid([]); // false
v::undef()->isValid(' '); // false
v::undef()->isValid(0); // false
v::undef()->isValid('0'); // false
v::undef()->isValid('0.0'); // false
v::undef()->isValid(false); // false
v::undef()->isValid(['']); // false
v::undef()->isValid([' ']); // false
v::undef()->isValid([0]); // false
v::undef()->isValid(['0']); // false
v::undef()->isValid([false]); // false
v::undef()->isValid([[''], [0]]); // false
v::undef()->isValid(new stdClass()); // false

Templates

Undef::TEMPLATE_STANDARD

Mode Template
default {{subject}} must be undefined
inverted {{subject}} must be defined

Template placeholders

Placeholder Description
subject The validated input or the custom validator name (if specified).

Categorization

  • Miscellaneous

Changelog

Version Description
3.0.0 Renamed to Undef and changed the behavior
1.0.0 Created as NotOptional

See also: