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Language: new MyClass()->method() — dereferencable new without outer parens missing (PHP 8.4, RFC new_without_parentheses) #6974
Description
Category
language · php-src-strict · PHP 8.4
Problem
PHP 8.4 allows dereferencable new expressions — method/property/static access on a freshly constructed object without wrapping the whole expression in parentheses, as long as constructor parentheses are present:
echo new Greeter()->greet();
echo new Greeter()->property;
echo new Greeter()::staticMethod();This compiler fails to parse (Syntax error, unexpected T_OBJECT_OPERATOR on the -> after new Class()). Valid programs must keep the old (new Greeter())->greet() form.
php-src reference
- php/php-src RFC: new_without_parentheses
- php/php-src
Zend/zend_language_parser.y— dereferencablenewwith ctor-args parens - php/php-src
Zend/zend_compile.c—zend_compile_new()
Repro
<?php
declare(strict_types=1);
class Greeter
{
public function greet(): string
{
return 'hello';
}
}
echo new Greeter()->greet(), "\n";./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php test/repro-maintainer/new_chain_without_parens.php 2>&1 | head -8
'Expected (PHP 8.4): hello
Actual: parse failure on line with new Greeter()->greet()
Scope (PHP-in-PHP first)
| Layer | Path |
|---|---|
| Parser / php-cfg | extend new expression grammar for dereferencable ctor-args form |
| Compiler | emit same lowering as (new Class())->member |
| Tests | test/compliance/cases/language/new_dereferencable.phpt (method, property, static, dynamic class name) |
Done when
- Repro parses and prints
hello -
new Class()->prop,new Class()::CONST,new $dyn()->m()parity on VM - JIT/AOT when lowering shares desugar with parenthesized form
-
./script/ci-fast.sh --filter new_dereferencablegreen on VM
Related
- Language: first-class callable on
(new Class())->method(...)— TypeReconstructor compile crash #6725 (first-class callable on(new Class())->method) · Language:newwithout()in class initializers must compile-error (zend_compile.c) #6549 · Epic: Self-host critical path — compiler compiles itself (M3→M5) #1492
Activity
PurHur commentedon Jun 6, 2026
claim: worker-lane-c — starting this run
Language: desugar dereferencable new without outer parens (#6974) (#6996
PurHur commentedon Jun 6, 2026
Merged via #6996
Fix:
NewDereferenceableDesugarinlib/Ast/rewrites PHP 8.4 dereferencablenew(new Class()->m()) to parenthesized form before nikic/php-parser v4 — same pattern as pipe/in operator desugars. Compiler lowering unchanged.Verification:
→
hello; PHPUnit OK (8 unit + 2 compliance).Language: gate dereferencable new on 8.4 profile (#19684) (#19692)