PHP8: Attributes Support

[zonuexe]

Specification

• Accepted RFC
  • PHP RFC: Attributes v2 (Probably this result will be overturned)
• Amending RFC
  • PHP RFC: Attribute Amendments
  • PHP RFC: Shorter Attribute Syntax

Example

<<WithoutArgument>>
<<SingleArgument(0)>>
<<FewArguments('Hello', 'World')>>
function foo() {}

<<WithoutArgument>><<SingleArgument(0)>><<FewArguments('Hello', 'World')>>
function bar() {}

PHP Mode implementation

• Face and font-lock
• Indentation (vsemi)

[zonuexe]

This is valid syntax, but not attribute.

<?php

const Attribute = 0;

1 <<Attribute>> 2;

if (1 <<Attribute>> 2) Attribute;

[zonuexe]

This is also valid, of course, but since it is not a general description, coloring as an attribute is allowed.

<?php

const Attribute = 0;

if (1 
<<Attribute>>
2) Attribute;

[zonuexe]

https://github.com/php/php-src/pull/5394/files

$ref = new \ReflectionFunction(<<A1>> <<A2>> <<A5>> function () { });
$attr = $ref->getAttributes(\stdClass::class, \ReflectionAttribute::IS_INSTANCEOF);
var_dump(count($attr));
print_r(array_map(fn ($a) => $a->getName(), $attr));

[zonuexe]

Since two competing RFCs have been voted recently, the decision is about to be overturned.

We have to carefully review the logic for font-locking and indentation, especially if #[ ... ] were accepted.