symfony/UPGRADE-4.0.md

UPGRADE FROM 3.x to 4.0

DependencyInjection

• Using unsupported configuration keys in YAML configuration files raises an exception.

• Using unsupported options to configure service aliases raises an exception.

Form

• The choices_as_values option of the ChoiceType has been removed.

HttpKernel

• Possibility to pass objects as URI attributes to the ESI and SSI renderers has been removed. The inline fragment renderer should be used with object attributes.

Serializer

• The ability to pass a Doctrine Cache instance to the ClassMetadataFactory class has been removed. You should use the CacheClassMetadataFactory class instead.

Yaml

• Starting an unquoted string with % leads to a ParseException.

• The Dumper::setIndentation() method was removed. Pass the indentation level to the constructor instead.

• Removed support for passing true/false as the second argument to the parse() method to trigger exceptions when an invalid type was passed.

  Before:

  Yaml::parse('{ "foo": "bar", "fiz": "cat" }', true);
  

  After:

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

• Removed support for passing true/false as the third argument to the parse() method to toggle object support.

  Before:

  Yaml::parse('{ "foo": "bar", "fiz": "cat" }', false, true);
  

  After:

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

• Removed support for passing true/false as the fourth argument to the parse() method to parse objects as maps.

  Before:

  Yaml::parse('{ "foo": "bar", "fiz": "cat" }', false, false, true);
  

  After:

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

• Removed support for passing true/false as the fourth argument to the dump() method to trigger exceptions when an invalid type was passed.

  Before:

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

  After:

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

• Removed support for passing true/false as the fifth argument to the dump() method to toggle object support.

  Before:

  Yaml::dump(array('foo' => new A(), 'bar' => 1), 0, 0, false, true);
  

  After:

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

• The !!php/object tag to indicate dumped PHP objects was removed in favor of the !php/object tag.