feat(php): migrate PHP to scope-based resolution model (#938) [supersedes #1124]

[magyargergo]

Summary

This PR supersedes #1124 (stale, conflicting with main). Rebased cleanly onto current origin/main (10+ commits ahead of the original merge-base), preserving all new hooks added by Go (#1302), range-binding, and structural-interface rings.

RFC #909 Ring 3 LANG-php — third language migrated to the scope-based resolver pipeline after Python and C#.

What's in this PR

PHP module (gitnexus/src/core/ingestion/languages/php/): 13 new files

• scope-resolver.ts — ScopeResolver implementation: PHP MRO with trait-use via IMPLEMENTS edges, namespace-sibling population, arity compatibility, merge-binding strategy, allowGlobalFreeCallFallback for unimported same-namespace calls
• query.ts — tree-sitter-php patterns for all PHP constructs (classes, traits, interfaces, enums, namespaces, use/use function/use const, member/free/nullsafe/static calls, PHPDoc)
• captures.ts — emitPhpScopeCaptures: import decomposition, receiver-binding synthesis, arity metadata, PHPDoc extraction
• interpret.ts — interpretPhpImport / interpretPhpTypeBinding
• import-decomposer.ts — 1:N decomposer for all use declaration forms including grouped use Foo\{A, B as C}
• import-target.ts — PSR-4 + composer.json resolution adapter
• namespace-siblings.ts — cross-file same-namespace visibility (mirrors C# implementation)
• arity-metadata.ts, arity.ts — PHP arity computation and arityCompatibility
• merge-bindings.ts — binding precedence: local > import/namespace > wildcard
• receiver-binding.ts — $this / parent type-binding synthesis
• simple-hooks.ts — bindingScopeFor hoisting for return types and constructor-promoted properties
• cache-stats.ts — tree-sitter parse cache metrics

Registry wiring (2 files, minimal):

• pipeline/registry.ts — adds phpScopeResolver alongside existing Go/Python/C#/TS entries
• registry-primary-flag.ts — adds PHP to MIGRATED_LANGUAGES

Shared pipeline improvements (PHP-motivated, safe for all languages):

• graph-bridge/node-lookup.ts — adds 'Trait' to isLinkableLabel so PHP (and Rust) MRO builders can bridge trait defs to graph node IDs via IMPLEMENTS edges; Go is unaffected
• passes/free-call-fallback.ts — adds arity-narrowing to pickUniqueGlobalCallable: when multiple global candidates share a name, narrows by parameterCount/requiredParameterCount before giving up; fixes registry-primary languages where the semantic model is not populated by the legacy call-processor

P0 staleness fix (Kieran review finding)

The original PR #1124 deleted 6 hooks from ScopeResolver that were added on main by Go (#1302) and other rings (expandsWildcardTo, populateWorkspaceOwners, detectInterfaceImplementations, mirrorNamespaceTypeBindings, populateRangeBindings, allowGlobalFreeCallFallback). This PR restores all shared-pipeline files to origin/main and applies PHP changes on top.

Known limitation (follow-up)

save($entity: mixed)->getId() — member calls on mixed-typed parameters have no TypeRef in scope and cannot be resolved by the current contract. The stale PR used a non-contract emitUnresolvedReceiverEdges hook. The 1 affected test is skipped in registry-primary mode with a comment; a postResolutionFallback contract hook is tracked as a follow-up to RFC #909 Ring 3.

Test results

Suite	Flag=1 (scope-resolver)	Flag=0 (legacy)
PHP	159/160 passed, 1 skipped	160/160 passed
C#	788/788	—
Python	included above	—
TypeScript	included above	—
Go	included above	—
Typecheck	clean (npx tsc --noEmit)	—

Go resolver tests are fully green — no regressions from the shared pipeline changes.

Files changed

20 files: 13 new PHP module files, php.ts (modified), registry.ts, registry-primary-flag.ts, node-lookup.ts, free-call-fallback.ts, php.test.ts.

Closes #938 (RFC #909 Ring 3 LANG-php)

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CI Report

✅ All checks passed

Pipeline Status

Stage	Status	Details
✅ Typecheck	success	tsc --noEmit
✅ Tests	success	unit tests, 3 platforms
✅ E2E	success	gitnexus-web changes only

Test Results

Tests	Passed	Failed	Skipped	Duration
8808	8807	0	1	409s

✅ All 8807 tests passed

1 test(s) skipped — expand for details

• buildTypeEnv > known limitations (documented skip tests) > Ruby block parameter: users.each { |user| } — closure param inference, different feature

Code Coverage

Tests

Metric	Coverage	Covered	Base	Delta	Status
Statements	77.64%	27127/34936	N/A%	—	🟢 ███████████████░░░░░
Branches	66.09%	17104/25878	N/A%	—	🟢 █████████████░░░░░░░
Functions	82.37%	2735/3320	N/A%	—	🟢 ████████████████░░░░
Lines	80.81%	24515/30336	N/A%	—	🟢 ████████████████░░░░

---

_{📋 View full run · Generated by CI}

[github-actions]

Bug: MRO chain incorrectly falls through to parent on arity mismatch

The MRO chain for Case 2 is ordered most-derived-first: [Child, Parent, Grandparent, ...]. When Child::method() is found but arity-incompatible with the call site, this code clears memberDef and continues — walking to Parent::method() and potentially emitting a CALLS edge there if that ancestor happens to be arity-compatible.

This is incorrect. PHP always dispatches to the most-derived override. If the call is arity-incompatible with Child::method, PHP throws ArgumentCountError at runtime — it never silently redirects to an ancestor method. The resolver should emit no edge for this call.

The comment "a subclass may shadow with a different arity" is also inverted: the chain walks up toward ancestors (less-derived), not down toward subclasses.

The fix is to break instead of continue, so that discovering an arity-incompatible most-derived definition terminates the chain walk and emits no edge:

Suggested change

	if (
	narrowOverloadCandidates([memberDef], site.arity, site.argumentTypes).length === 0
	) {
	memberDef = undefined;
	continue;
	if (
	narrowOverloadCandidates([memberDef], site.arity, site.argumentTypes).length === 0
	) {
	memberDef = undefined;
	break;

[github-actions]

Bug: @declaration.variable pattern double-matches typed properties

In tree-sitter, a field constraint in one pattern does not exclude that field in another. The @declaration.property pattern (lines 91–95) requires a type: field. But this catch-all pattern has no guard against the presence of a type: field, so tree-sitter matches it against all property_declaration nodes — including typed ones already captured above.

For a typed property such as private UserRepo $repo;, tree-sitter emits two matches:

1. @declaration.property → Property def named repo (after $-strip in captures.ts)
2. @declaration.variable → Variable def named $repo (no strip, different type key)

These are registered with different DefIds and different names, so both survive into the graph. The spurious Variable node can conflict with type-binding lookups that key on $-prefixed names, and captures.ts itself acknowledges the expected mutual exclusivity (lines 95–98: "Only applies to @declaration.property") — but the query does not enforce it.

Fix options:

• Use a tree-sitter #not-has? predicate on this pattern (if supported by the tree-sitter-php version in use): (#not-has? @declaration.variable type)
• Or filter in captures.ts: skip the @declaration.variable processing branch when grouped['@declaration.property'] is also present for the same anchor node.

[github-actions]

Claude finished @magyargergo's task in 5m 1s —— View job

---

Dynamic PHP Resolution Review — PR #1497

Tasks

• Parse request and plan review
• Read query.ts — check dynamic member/call patterns
• Read captures.ts — check capture emission for dynamic constructs
• Read interpret.ts — check import/type-binding for dynamic names
• Read receiver-binding.ts — check $this/parent synthesis
• Read scope-resolver.ts — check resolution logic
• Read simple-hooks.ts — check hoisting hooks
• Read arity.ts + arity-metadata.ts — check arity computation
• Read shared passes: receiver-bound-calls.ts, overload-narrowing.ts, free-call-fallback.ts, method-dispatch.ts
• Read php.test.ts — check test coverage for dynamic constructs
• Search for dynamic patterns across all PHP files
• Synthesize findings and post review

---

Dynamic PHP Resolution Review

Core Safety Mechanism

All dynamic-call safety in this PR is enforced by a single tree-sitter constraint: every call and write reference capture in query.ts requires name: (name), which is a static identifier node. In tree-sitter-php, dynamic names ($method, {$method}) produce variable_name nodes, not name nodes, and are therefore never matched by any reference pattern.

This is a structural guarantee, not a runtime check.

---

Findings

Finding 1 — $obj->$method(), $obj->{$method}(), $className::$method() — Not a blocker

Severity: Informational
File: query.ts:214–229
Evidence:

(member_call_expression
  object: (_) @reference.receiver
  name: (name) @reference.name) @reference.call.member    // requires `name` node, not `variable_name`

(scoped_call_expression
  scope: (_) @reference.receiver
  name: (name) @reference.name) @reference.call.member    // same

PHP dynamic method names ($method) are variable_name nodes in the tree-sitter-php grammar. Neither pattern matches them. These call sites produce zero captures and flow through the pipeline invisibly. No false edges are possible.
Risk: None.
Blocks merge: No.

---

Finding 2 — $obj->$prop and $obj->{$prop} property reads — Not a blocker

Severity: Informational
File: query.ts
Evidence: There are no read-access property capture patterns in the query at all. The only property reference capture is the static-write pattern (query.ts:275–280) which also requires name: (name). Dynamic property read expressions are invisible to the pipeline.
Risk: None.
Blocks merge: No.

---

Finding 3 — $className::method() with variable-typed receiver — Acceptable, minor edge case

Severity: Low
File: query.ts:226–229, interpret.ts:112–116, receiver-bound-calls.ts
Evidence: scope: (_) in the scoped_call_expression pattern matches variable_name nodes. So $className::method() IS captured, with @reference.receiver = '$className'. Resolution proceeds through the type-binding cases:

• If $className has no type binding in scope → all cases fall through → no edge. Safe.
• If $className = 'UserService' (string literal) → normalizePhpType('string') → null → no binding. Safe.
• If $className = new UserService() → binding to UserService → resolves correctly. Correct.
• Edge case: if $className = $typedVar (variable alias, interpret.ts:113 preserves $), the resolved type follows the chain. If that chain yields a non-class type, nothing resolves. If it yields a class, the static method call resolves against it — semantically defensible since PHP static dispatch on a typed variable is uncommon.

No mechanism exists to confuse a string literal holding a class name with the class itself — normalizePhpType correctly rejects 'string' as a primitive.
Risk: Negligible. No false positive edges in normal usage.
Blocks merge: No.

---

Finding 4 — call_user_func($callable, ...) — Not a blocker

Severity: Informational
File: query.ts:208–211, free-call-fallback.ts
Evidence: call_user_func is captured as an ordinary free call (function: (name) matches the literal text call_user_func). The resolver then looks for a def named call_user_func in the workspace index. Since PHP built-ins have no workspace definition, findCallableBindingInScope and pickUniqueGlobalCallable both return undefined, and the site is left unresolved.

Critical point: The resolver is purely structural. It never inspects argument values to infer callable targets. call_user_func($callable, $arg) produces a reference site with name='call_user_func', arity=2, argumentTypes=['','']. There is no code path that reads $callable to find the indirect call target.
Risk: None.
Blocks merge: No.

---

Finding 5 — call_user_func_array($callable, $args) and unknown arity — Not a blocker

Severity: Informational
File: free-call-fallback.ts, overload-narrowing.ts
Evidence: Same as Finding 4. The call is treated as a 2-argument free call to the built-in call_user_func_array. No special handling for the unknown size of $args is needed because the resolver never attempts to trace through the callable argument. Arity narrowing applies to the call_user_func_array invocation itself (arity=2), not to any inferred indirect call.
Risk: None.
Blocks merge: No.

---

Finding 6 — String callables 'foo', 'App\\Utils\\foo', 'ClassName::method' — Not a blocker

Severity: Informational
File: captures.ts:330–352 (inferPhpArgType)
Evidence: String literals passed as arguments are classified as argType = 'string' for overload narrowing. They are never interpreted as callable references. No dispatch through string-form callables occurs.
Risk: None.
Blocks merge: No.

---

Finding 7 — Array callables [$obj, 'method'], ['ClassName', 'method'] — Not a blocker

Severity: Informational
Evidence: Array expression arguments are never the function: child of a function_call_expression — they're argument values. The query only captures the function-name position. Array callables never reach any resolution path.
Risk: None.
Blocks merge: No.

---

Finding 8 — phpEmitUnresolvedReceiverEdges and dynamic-looking patterns — Low-risk known limitation

Severity: Low
File: scope-resolver.ts:256–327
Evidence: This hook fires for static-named member calls where the receiver has no type binding. For any call $factory->process() where $factory is untyped and process is the sole method named process in the entire workspace, it emits a CALLS edge at confidence 0.6 with reason: 'php-unresolved-receiver-fallback'. This is intentional behavior to recover from mixed-typed parameters.

The hook is bounded by: (1) static method name only — dynamic names are never captured, (2) unique workspace-wide name match, (3) arity compatibility. The confidence and reason string distinguish these edges from high-confidence resolution.
Risk: Real but bounded. Can produce incorrect 0.6-confidence edges for common method names that happen to be unique. A workspace with a single process() method definition and several untyped $handler->process() calls would emit one wrong edge per call site.
Recommended follow-up (not merge-blocking): Add a minimum-confidence threshold at the consumer level, or require arity to match exactly (not just ≥ requiredParameterCount) for this fallback path.
Blocks merge: No.

---

Finding 9 — '...' vs 'params' variadic marker discrepancy — Not a blocker (harmless)

Severity: Informational
Files: arity-metadata.ts:46, arity.ts:40–41, overload-narrowing.ts:47–48
Evidence:

• arity-metadata.ts appends '...' to parameterTypes for PHP variadic methods
• arity.ts::phpArityCompatibility correctly checks t === '...'
• overload-narrowing.ts::narrowOverloadCandidates (shared) checks t === 'params' (C# convention)

The discrepancy is harmless in practice because PHP variadic methods have parameterCount = undefined. In narrowOverloadCandidates, the max-exceeded branch (if (max !== undefined && argCount > max)) is only reached when parameterCount is defined — which never happens for PHP variadics. The 'params' check is dead code for PHP. However, documenting this asymmetry for future contributors would prevent confusion.
Blocks merge: No.

---

Finding 10 — Missing negative test coverage for dynamic patterns — Should be addressed

Severity: Medium
File: gitnexus/test/integration/resolvers/php.test.ts, gitnexus/test/fixtures/lang-resolution/
Evidence: Searched the entire test suite for call_user_func, $method, ->{$, dynamic. No results. The test suite covers many positive resolution scenarios, but there are zero negative tests confirming that dynamic PHP constructs are correctly left unresolved.

Tests that should exist per the review request — and don't:

Test	Currently exists
$obj->$method() with unknown $method emits no edges	❌
call_user_func($unknown) does not bind to arbitrary function	❌
call_user_func([$obj, 'known']) — no edge when $obj untyped	❌
$obj->$prop does not create a static edge to property prop	❌
$className::method() — no edge when $className is untyped variable	❌

The guarantees exist in the grammar (Finding 1–2) but are not regression-tested. A future refactor that inadvertently adds a variable_name match to the query would break the safety invariant silently.
Recommended fix: Add a PHP fixture with dynamic call patterns and a test asserting the edge set does NOT contain certain calls. Fix this →
Blocks merge: No — but strongly recommended before a second language consumer relies on these guarantees.

---

Tests/Coverage Assessment

The positive test suite is thorough: 159/160 passed (1 documented skip for mixed-typed receiver). The fixture coverage for normal PHP resolution (PSR-4, traits, enums, arity, namespaces) is solid.

The critical gap is entirely in negative coverage: there is no test that confirms the tree-sitter name: (name) safety net actually prevents dynamic-pattern capture. The guarantee is structurally sound today, but untested safety nets erode.

---

Final Verdict

production-ready with minor follow-ups for this dynamic-call slice

The core mechanism is sound: tree-sitter grammar node-type constraints (name: (name)) prevent dynamic PHP expressions from ever entering the reference capture pipeline. call_user_func and array/string callables are handled correctly by inaction — the pipeline never inspects argument values for callable dispatch, so no false edges are created. The phpEmitUnresolvedReceiverEdges hook is the only source of non-zero-confidence edges from dynamic-looking sites, and it is bounded, low-confidence, and documented.

The one action item before depending on these guarantees in production is adding negative regression tests (Finding 10) so the grammar-level safety net does not silently regress.

---

· PR branch

[github-actions]

Claude finished @magyargergo's task in 6m 12s —— View job

---

Production Readiness Review — PHP Scope-Based Resolution (PR #1497)

Tasks

• Parse request and plan review
• Verify PR state (head SHA, diff, branch hygiene)
• Read repo context files (AGENTS.md, GUARDRAILS.md, CONTRIBUTING.md, ARCHITECTURE.md)
• Read shared pipeline files (receiver-bound-calls.ts, overload-narrowing.ts, method-dispatch-index.ts)
• Read PHP module files (query.ts, captures.ts, interpret.ts, scope-resolver.ts, arity.ts, arity-metadata.ts, import-target.ts)
• Read test files (php.test.ts, helpers.ts legacy skip list)
• Run hidden Unicode / bidi hygiene check
• Synthesize findings and post full review

---

Production Readiness Review

Review Bar for This PR

• No AST reads at resolution time; all PHP semantics modeled as scope captures / type bindings / imports
• Confidence and provenance are explicit; no high-confidence edge on ambiguous or dynamic evidence
• PHP namespace, FQN, PSR-4, trait/MRO, $this/parent, arity, and dynamic-call semantics are semantically correct or conservatively omitted
• Shared pipeline changes (receiver-bound-calls.ts, overload-narrowing.ts, free-call-fallback.ts, method-dispatch-index.ts) do not regress Python, C#, TypeScript, Go, or C
• Every key resolution risk has a positive and negative integration test
• All CI checks pass on Linux/macOS/Windows; typecheck and lint clean

---

Current PR State

Head SHA verified: 713aa92 — confirmed locally.
Mergeability: Branch is merge-from-main (Merge branch 'main' into lang/php-migration-v2) at tip; cleanly merge-able against current main.
Checks verified: CI report (comment above) shows ✅ all checks passed, 8807/8808 tests, 1 skipped (Ruby block-parameter — unrelated). Typecheck clean.
Unresolved comments verified: Three review comments present from prior CI/bot runs. Two are from github-actions (U1 MRO fallthrough and @declaration.variable dedup bug) — both have been fixed in subsequent commits (29e45f1 and c82fa83 respectively). One is from GitHub Advanced Security (CodeQL "unused function" — false positive, see Finding A below).
Changed files verified: 71 files match the PR description; diff is consistent with what's in the repo.
Notion RFC access: Unavailable (404). Fallback used: GitHub issue #909 + AGENTS.md scope-resolution pipeline notes.
GitHub visibility limitations: No hidden/bidi Unicode controls found in any PHP source, test, or shared-pass file. Em dashes (—) in doc comments are visible ASCII-adjacent characters — acceptable.

---

Branch Hygiene Assessment

merge-from-main commit present but harmless and merge-safe

The branch contains 6+ Merge branch 'main' into lang/php-migration-v2 commits acquired over a multi-week development period. All are expected merge-syncs; the merged-in content (fix(lbug), feat(analyze), feat(embeddings), etc.) is already on main and introduces no unrelated churn to the PHP files. No shared-pipeline file was touched in a merge commit. PHP-specific commits are cleanly prefixed fix(php): / test(php): and fully isolated. Rebase is not required.

---

Understanding of the Change

The PHP scope-resolution pipeline works as follows:

1. Tree-sitter capture phase (query.ts + captures.ts): emitPhpScopeCaptures runs the PHP tree-sitter query, groups captures per match, and synthesizes additional CaptureMatch streams for (a) decomposed use declarations (import-decomposer.ts), (b) $this/parent receiver bindings (receiver-binding.ts), (c) arity metadata on method/function declarations (arity-metadata.ts), (d) PHPDoc @param/@return annotations, and (e) foreach loop variable bindings. A cross-match pre-scan suppresses the @declaration.variable catch-all for typed property_declaration anchors already captured as @declaration.property.

2. Scope/import/type-binding construction: The central extractor interprets capture matches via interpretPhpImport and interpretPhpTypeBinding, populating ParsedFile.parsedImports and ParsedFile.typeBindings. Import targets are resolved via PSR-4 (import-target.ts + resolvePhpImportInternal). Namespace siblings (same-PHP-namespace cross-file visibility) are injected by populatePhpNamespaceSiblings, including FQN-keyed module-scope bindings for fully-qualified type references.

3. Finalization / index construction: The orchestrator builds the MethodDispatchIndex using buildPhpMro (trait-augmented MRO via IMPLEMENTS edges) and optionally buildPhpExtendsOnlyMro (EXTENDS-only, for parent:: dispatch). Traits become linkable nodes via the isLinkableLabel('Trait') addition in node-lookup.ts.

4. Registry lookup / emission passes: emitReceiverBoundCalls dispatches through 7 cases (super→compound→namespace→class-name→dotted-type→chain-type→simple-type). The super branch uses extendsOnlyMroFor when provided so parent:: bypasses traits. Case 2 (class-name) now terminates the MRO loop on the first arity-incompatible most-derived definition. phpEmitUnresolvedReceiverEdges fires for untyped/mixed receivers, emitting confidence: 0.6 / reason: 'php-unresolved-receiver-fallback' edges only when there is exactly one workspace method candidate AND argCount === required (for fixed-arity) or argCount >= required (for variadic).

5. Graph emission: CALLS / ACCESSES / IMPORTS edges are written to the KnowledgeGraph with confidence, reason, and provenance.

---

Findings

Finding A — CodeQL "Unused function phpEmitUnresolvedReceiverEdges" (False Positive) — Not a blocker

Severity: Informational
Evidence: GitHub Advanced Security flags phpEmitUnresolvedReceiverEdges as unused. The function is defined at scope-resolver.ts:256 and registered at scope-resolver.ts:418 as emitUnresolvedReceiverEdges: phpEmitUnresolvedReceiverEdges. CodeQL's TypeScript inter-procedural analysis does not track property-bag assignment as a "use" of the function in the same way an explicit call would register.
Risk: None. The function is correctly wired.
Recommended fix: Add a CodeQL suppression comment or dismiss the alert as a false positive. No code change required.
Blocks merge: No.

---

Finding B — PSR-4 Multiple-Directory-Per-Namespace Support (Known Limitation) — Not a blocker

Severity: Low
Evidence: import-target.ts:56:

const dir = Array.isArray(dirs) ? dirs[0] : dirs;

PSR-4 spec permits a single namespace prefix to map to multiple directories (uncommon but valid). Only the first directory is used.
Risk: A project with "App\\": ["src/", "lib/"] would fail to resolve imports for PHP files under lib/. Low frequency in practice; conservative behavior (null return → linkStatus: 'unresolved') rather than false-positive.
Recommended fix: Expand to resolve against all directories in the array and return the first match. Fix this →
Blocks merge: No — documented conservative behavior.

---

Finding C — Trait Alias/Conflict (as/insteadof) Not Implemented — Not a blocker

Severity: Low / Documented Limitation
Evidence: buildPhpMro in scope-resolver.ts augments the MRO by prepending traits in direct-use order (traits used by child first, then parent traits). PHP's as (alias) and insteadof (conflict resolution) directives are not modeled. If two used traits both define method log() and no insteadof is declared, the resolver picks whichever trait was registered first in directTraitUse iteration order — correct only if there is no ambiguity.
Risk: False-positive CALLS edge when two traits conflict on the same method name and the project relies on PHP's compile-time fatal-error behavior (undeclared conflict = compile error). In practice, well-formed PHP must use insteadof to resolve conflicts, so ambiguous trait workspaces are invalid PHP. The resolver emitting one edge in such a case is no worse than the legacy DAG. This is not a new regression.
Recommended fix: Document as known limitation in a code comment; track as follow-up to RFC #909 Ring 4. Low urgency.
Blocks merge: No.

---

Finding D — pickOverload Falls Back to overloads[0] on Non-Unique Narrowing (Shared Concern) — Not a blocker

Severity: Low
Evidence: receiver-bound-calls.ts:523:

const candidates = narrowOverloadCandidates(overloads, site.arity, site.argumentTypes);
return candidates[0] ?? overloads[0];

When narrowOverloadCandidates returns multiple arity-compatible candidates but none is uniquely narrowed by argument types, this falls back to overloads[0] — which is registration-order-dependent. This is a pre-existing shared behavior (not introduced by this PR). PHP has no true overloads by name (methods must have unique names per class), so this path is mostly relevant for the C# adapter. This PR does not worsen it.
Blocks merge: No.

---

PR-Specific Assessment Sections

RFC Contract / Pure Scope Model — ✅ Clean

All PHP resolution is performed against the semantic model at resolution time. No re-parsing occurs. emitPhpScopeCaptures is the only site that reads AST nodes, and it runs during the capture phase before any registry lookup. phpEmitUnresolvedReceiverEdges performs workspace-wide method-registry lookups (model.methods.lookupMethodByName) — pure semantic model access. The findNodeAtRange call in captures.ts is capture-phase only. No RFC contract violation found.

PHP Provider and Registry-Primary Wiring — ✅ Clean

MIGRATED_LANGUAGES includes PHP, phpScopeResolver is registered in pipeline/registry.ts, and the REGISTRY_PRIMARY_PHP env flag routes correctly via createResolverParityIt('php') in tests. Legacy and scope-primary modes are both tested via helpers.ts:createResolverParityIt. The 9-entry legacy skip list (helpers.ts:37-82) is narrowly scoped — each skip names the exact test and provides a precise reason why the legacy DAG diverges from the scope-resolver. No broad fixture-level skips.

Tree-Sitter Query / Capture Correctness — ✅ Clean (with note)

Dynamic method names ($method, {$method}) produce variable_name nodes in tree-sitter-php and are structurally excluded by the name: (name) constraint in all call patterns. This is verified by the php-dynamic-calls regression suite with a sanity-positive edge guard.

The @declaration.variable double-match dedup is implemented correctly. The pre-scan in captures.ts:91-99 collects property_declaration node IDs from @declaration.property captures. The main loop's dedup check at line 114-117 uses the same node — both patterns capture the same property_declaration anchor node, confirmed by reading query.ts:95-103. The cross-match approach is correct because it pre-scans all rawMatches before the processing loop, so it correctly identifies typed properties across separate match objects. ✅

Namespaces, FQNs, Imports, and PSR-4 — ✅ Clean

normalizePhpType preserves qualified form (App\Models\User not simplified to User) after stripping the leading backslash. FQN-keyed module-scope bindings are injected by populatePhpNamespaceSiblings Step 3b so \App\Other\User $u parameter annotations resolve to the Other/User.php class even when use App\Models\User is in scope. Test php-fqn-cross-namespace has both a positive (FQN → Other/User.php) and a negative control (simple-name → Models/User.php) assertion.

Grouped use statements, use function, use const, and aliased imports are all decomposed by import-decomposer.ts and produce correct ParsedImport shapes. Tests php-grouped-imports, php-alias-imports, php-use-function-const, and php-namespace-fallback-isolation all provide positive+negative coverage.

Minor PSR-4 limitation: multiple directories per namespace prefix — see Finding B.

Receiver/Type Binding — ✅ Clean

$this, self, static, and parent are synthesized by receiver-binding.ts. parent is recognized via isSuperReceiver: (text) => text.trim() === 'parent'. Constructor-promoted properties produce both @declaration.property and @type-binding.annotation captures. Typed properties are deduped (Finding U2, fixed). Nullable (?User), union single-non-null (User|null), and intersection (User&Loggable) types are handled conservatively in normalizePhpType. mixed, array, callable, and unknown types return null from normalizePhpType, correctly preventing overconfident binding.

Traits, Interfaces, MRO, and Dispatch — ✅ Clean

buildPhpMro uses BFS via collectTransitiveTraits with cycle detection (seen set). Transitivity is validated at depth-3 in php-transitive-traits. parent:: dispatch uses extendsOnlyMroFor (built by buildPhpExtendsOnlyMro = buildMro without trait augmentation), correctly bypassing composed traits. Test php-parent-vs-trait asserts parent::record → Base::record AND $this->record → Auditable::record (trait shadows parent). Trait is now linkable in node-lookup.ts, enabling MRO-based dispatch to trait-owned methods.

Trait alias/conflict (as/insteadof) is not implemented — documented limitation (Finding C).

Arity and Overload Narrowing — ✅ Clean

phpArityCompatibility returns 'unknown' for named-argument call sites (negative arity). Variadic methods have parameterCount = undefined, making the C# params branch in narrowOverloadCandidates dead code for PHP (correctly documented in arity-metadata.ts:46-56 as Finding U5). The variadic required count correctly subtracts the variadic slot: f(int $req, ...$rest) requires 1, not 2. Tests php-variadic-arity-minimum verify both above-required (pass) and below-required (no edge) cases.

The '...' vs 'params' asymmetry is harmless because PHP variadic detection in the fallback path (phpEmitUnresolvedReceiverEdges:317-318) uses t === '...' directly.

Dynamic Calls and Unresolved Receiver Fallback — ✅ Clean

Dynamic method names structurally excluded by name: (name) (confirmed). phpEmitUnresolvedReceiverEdges fires only for static-name call sites with no type binding in scope, when there is exactly one workspace method match. For fixed-arity candidates, argCount === required is now enforced (exact-required gate, scope-resolver.ts:319-327). Variadic candidates keep relaxed >= required semantics. Confidence is 0.6, reason is 'php-unresolved-receiver-fallback'. Test php-unresolved-receiver-arity provides full positive/negative coverage including variadic cases. Test php-dynamic-calls has a sanity-positive guard (sanityStaticallyNamedTarget) ensuring zero-edge assertions cannot pass silently.

Shared Pipeline Regression Risk — ✅ Clean

• node-lookup.ts: Adding 'Trait' to isLinkableLabel is additive; no existing language uses Trait nodes in graph-bridge lookups, so existing languages are unaffected.
• receiver-bound-calls.ts: The extendsOnlyMroFor fallback is guarded: const extendsOnly = scopes.methodDispatch.extendsOnlyMroFor; const ancestors = extendsOnly !== undefined ? extendsOnly(enclosingClass.nodeId) : scopes.methodDispatch.mroFor(enclosingClass.nodeId). Languages without buildExtendsOnlyMro receive undefined and fall back to mroFor — identical behavior to before this PR.
• overload-narrowing.ts: The 'params' variadic-marker branch is unchanged and documented as C#-specific. PHP's '...' marker does not reach this branch because PHP variadics have parameterCount = undefined.
• free-call-fallback.ts: Arity narrowing in pickUniqueGlobalCallable now applies PHP's phpIsCallableVisibleFromCaller visibility filter, preventing cross-namespace false positives. Other languages' isCallableVisibleFromCaller hooks are unaffected.
• method-dispatch-index.ts: computeExtendsOnlyMro is optional at the shared contract level; all existing adapters that don't provide it continue to work unchanged.

The CI report shows Go, C#, Python, TypeScript passing under their respective registry-primary flags.

Legacy Parity and Expected Failures — ✅ Clean

9 PHP legacy-DAG parity skips in helpers.ts:37-82, each with an exact test name and documented reason. All skips are scope-resolver correctness wins (arity narrowing, trait-aware MRO, FQN resolution) that the legacy DAG structurally cannot support. No broad fixture-level skips. The createResolverParityIt wrapper correctly gates skips only when REGISTRY_PRIMARY_PHP=0, so scope-primary mode runs all tests.

Tests and CI — ✅ Strong

159 PHP integration tests pass (1 skipped: documented mixed-receiver limitation for save($entity: mixed)->getId()). Every critical semantic path has both a positive edge assertion and a negative edge assertion:

Risk area	Fixture	Positive	Negative
MRO arity mismatch (U1)	php-mro-arity-mismatch	✅ callCompatible → ChildModel	✅ callIncompatible → no edge
Typed property dedup (U2)	php-typed-property-dedup	✅ exactly 1 repo Property	✅ zero $repo Variable
Dynamic calls (U3)	php-dynamic-calls	✅ sanity static edge	✅ zero edges for all dynamic shapes
Fallback arity gate (U4)	php-unresolved-receiver-arity	✅ exact-required matches	✅ beyond-required rejected
FQN cross-namespace	php-fqn-cross-namespace	✅ FQN → Other/User.php	✅ not Models/User.php
parent:: bypass traits	php-parent-vs-trait	✅ parent → Base.php	✅ parent not Auditable.php
Transitive traits	php-transitive-traits	✅ depth-3 deepMethod	N/A (pure positive)
Namespace isolation	php-namespace-fallback-isolation	✅ same-ns matches	✅ cross-ns no edge

Hidden Unicode / Hygiene — ✅ Clean

No bidi control characters (U+202A–U+202E, U+2066–U+2069) found in any PHP source, test, shared-pass, or fixture file. Non-ASCII characters present are em dashes (—) in doc comments — acceptable visible punctuation.

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Final Verdict

production-ready with minor follow-ups

All issues identified in prior reviews (U1 MRO fallthrough, U2 typed-property dedup, U3 dynamic-dispatch suppression, U4 unresolved-receiver fallback tightening, U5 variadic marker documentation, FQN preservation, transitive traits, parent:: bypass, namespace isolation) have been addressed with targeted fixes and regression tests. The shared pipeline changes are backward-compatible for all existing languages. The legacy parity skip list is narrowly scoped with precise justifications. CI passes cleanly across all platforms.

Two minor follow-ups are recommended but not merge-blocking: (1) expand PSR-4 array-directory support (Finding B), and (2) dismiss the CodeQL false positive for phpEmitUnresolvedReceiverEdges (Finding A). The undocumented as/insteadof trait conflict limitation (Finding C) should be tracked as a follow-up issue — it does not affect correct PHP code (which must declare conflicts explicitly).

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