--- %YAML:1.0 test: Empty Sequence brief: > You can represent the empty sequence with an empty inline sequence. yaml: | empty: [] php: | array('empty' => array()) --- test: Empty Mapping brief: > You can represent the empty mapping with an empty inline mapping. yaml: | empty: {} php: | array('empty' => array()) --- test: Empty Sequence as Entire Document yaml: | [] php: | array() --- test: Empty Mapping as Entire Document yaml: | {} php: | array() --- test: Null as Document yaml: | ~ php: | null --- test: Empty String brief: > You can represent an empty string with a pair of quotes. yaml: | '' php: | ''