CHANGELOG

3.3.0

• Starting an unquoted string with a question mark followed by a space is deprecated and will throw a ParseException in Symfony 4.0.

• Deprecated support for implicitly parsing non-string mapping keys as strings. Mapping keys that are no strings will lead to a ParseException in Symfony 4.0. Use the PARSE_KEYS_AS_STRINGS flag to opt-in for keys to be parsed as strings.

Before:

   $yaml = <<<YAML
   null: null key
   true: boolean true
   1: integer key
   2.0: float key
   YAML;

   Yaml::parse($yaml);

After:

   $yaml = <<<YAML
   null: null key
   true: boolean true
   1: integer key
   2.0: float key
   YAML;

   Yaml::parse($yaml, Yaml::PARSE_KEYS_AS_STRINGS);

• Omitted mapping values will be parsed as null.

• Omitting the key of a mapping is deprecated and will throw a ParseException in Symfony 4.0.

• Added support for dumping empty PHP arrays as YAML sequences:

   Yaml::dump([], 0, 0, Yaml::DUMP_EMPTY_ARRAY_AS_SEQUENCE);

3.2.0

• Mappings with a colon (:) that is not followed by a whitespace are deprecated when the mapping key is not quoted and will lead to a ParseException in Symfony 4.0 (e.g. foo:bar must be foo: bar).

• Added support for parsing PHP constants:

   Yaml::parse('!php/const:PHP_INT_MAX', Yaml::PARSE_CONSTANT);

• Support for silently ignoring duplicate mapping keys in YAML has been deprecated and will lead to a ParseException in Symfony 4.0.

3.1.0

• Added support to dump stdClass and ArrayAccess objects as YAML mappings through the Yaml::DUMP_OBJECT_AS_MAP flag.

• Strings that are not UTF-8 encoded will be dumped as base64 encoded binary data.

• Added support for dumping multi line strings as literal blocks.

• Added support for parsing base64 encoded binary data when they are tagged with the !!binary tag.

• Added support for parsing timestamps as \DateTime objects:

   Yaml::parse('2001-12-15 21:59:43.10 -5', Yaml::PARSE_DATETIME);

• \DateTime and \DateTimeImmutable objects are dumped as YAML timestamps.

• Deprecated usage of % at the beginning of an unquoted string.

• Added support for customizing the YAML parser behavior through an optional bit field:

   Yaml::parse('{ "foo": "bar", "fiz": "cat" }', Yaml::PARSE_EXCEPTION_ON_INVALID_TYPE | Yaml::PARSE_OBJECT | Yaml::PARSE_OBJECT_FOR_MAP);

• Added support for customizing the dumped YAML string through an optional bit field:

   Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, Yaml::DUMP_EXCEPTION_ON_INVALID_TYPE | Yaml::DUMP_OBJECT);

3.0.0

• Yaml::parse() now throws an exception when a blackslash is not escaped in double-quoted strings

2.8.0

• Deprecated usage of a colon in an unquoted mapping value
• Deprecated usage of @, `, | and > at the beginning of an unquoted string
• When surrounding strings with double-quotes, you must now escape \ characters. Not escaping those characters (when surrounded by double-quotes) is deprecated.

Before:

   class: "Foo\Var"

After:

   class: "Foo\\Var"

2.1.0

• Yaml::parse() does not evaluate loaded files as PHP files by default anymore (call Yaml::enablePhpParsing() to get back the old behavior)