Fix PHP numeric deserializer keys

[AayushP123]

Summary

Fixes #7830.

PHP treats canonical numeric string array keys as integers. Generated deserializer maps now retain the required static-analysis annotation without losing numeric keys when a model inherits deserializers from its parent.

Changes

• Detect canonical numeric serialized property names.
• Emit an annotated local $deserializers array for affected models.
• Use array_replace instead of array_merge for affected inherited models so numeric keys are preserved.
• Keep the existing direct return and array_merge output for unaffected models.
• Add regression coverage for standalone and inherited numeric keys.
• Remove the two obsolete [PHP] "getFieldDeserializers() should return array..." with MERAKI.COM api #7830 integration-test exclusions.
• Add a changelog entry.

Testing

• Focused PHP writer tests (12 passed)
• dotnet test tests/Kiota.Builder.Tests/Kiota.Builder.Tests.csproj --no-restore --filter FullyQualifiedName!~KiotaSearcherTests (2,188 passed, 2 skipped)
• dotnet format kiota.slnx --include src/Kiota.Builder/Writers/Php/CodeMethodWriter.cs tests/Kiota.Builder.Tests/Writers/Php/CodeMethodWriterTests.cs --no-restore --verify-no-changes
• jq empty it/config.json

[Copilot]

Pull request overview

This PR updates the PHP writer to avoid PHPStan return-type inference failures for Parsable::getFieldDeserializers() when OpenAPI serialized property names are canonical numeric strings (e.g., "0", "500"), which PHP treats as integer array keys.

Changes:

• Detect canonical numeric serialized property names in generated PHP deserializers and emit an annotated local $deserializers variable before returning it.
• Preserve existing direct return [...] output for models without numeric serialized property names.
• Add PHP writer test coverage for a numeric serialized property name case, and document the change in the changelog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/Kiota.Builder/Writers/Php/CodeMethodWriter.cs	Adds canonical-numeric key detection and conditionally returns an annotated local deserializer array to satisfy static analysis.
tests/Kiota.Builder.Tests/Writers/Php/CodeMethodWriterTests.cs	Adds a regression test asserting the annotated $deserializers path is used for a "500" serialized name.
CHANGELOG.md	Notes the PHP static-analysis fix for numeric deserializer keys.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

[Wolfgang Knauf (WolfgangHG)]

AayushP123 Could you also remove the exclusion for this error in "config.json"?

kiota/it/config.json

Lines 165 to 175 in b9e6126

	"ExcludePatterns": [
	{
	"Language": "php",
	"Pattern": "/organizations/{organizationId}/apiRequests/overview",
	"Rationale": "Fails for php with api dated 2026-06-24 - https://github.com/microsoft/kiota/issues/7830"
	},
	{
	"Language": "php",
	"Pattern": "/networks/{networkId}/clients/{clientId}/splashAuthorizationStatus",
	"Rationale": "Fails for php with api dated 2026-06-24 (GET and PUT) - https://github.com/microsoft/kiota/issues/7830"
	}