Studio: Add PHP 8.5 support and fix JSON parsing of WP-CLI output

[epeicher]

Related issues

• Related to STU-1282

Proposed Changes

• Added PHP 8.5 to the supported PHP versions list and set it as the latest supported version
• Created parseJsonFromPhpOutput utility that extracts JSON from PHP output containing deprecation notices/warnings
• Applied robust JSON parsing across all 5 WP-CLI JSON parsing call sites to handle PHP warnings in output

PHP 8.5 introduces a deprecation warning from WP-CLI's bundled react/promise package ("Case statements followed by a semicolon are deprecated"). This warning gets prepended to stdout, causing JSON.parse() to fail with "Unexpected token 'D'" when parsing WP-CLI JSON output.

Testing Instructions

• Test WP-CLI commands that return JSON output with PHP 8.5 selected
• Verify site operations (start, stop, import/export) work correctly with PHP 8.5
• Test the export functionality to ensure database exports and default exports parse JSON correctly
• Test chat functionality that uses WP-CLI commands

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[Copilot]

Pull request overview

Adds PHP 8.5 as a supported runtime and hardens WP‑CLI JSON parsing to tolerate PHP 8.5 deprecation/warning noise being prepended to stdout (which otherwise breaks JSON.parse).

Changes:

• Add PHP 8.5 to SupportedPHPVersions and set LatestSupportedPHPVersion to 8.5.
• Introduce parseJsonFromPhpOutput helper to extract/parse JSON from mixed PHP output.
• Replace direct JSON.parse(stdout) usage with the new helper across WP‑CLI JSON parsing call sites (chat, site server, import/export).

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
common/types/php-versions.ts	Adds PHP 8.5 to supported versions and marks it as latest.
common/lib/php-output-parser.ts	New utility for extracting JSON from stdout containing PHP warnings/notices.
src/stores/chat-slice.ts	Uses the new parser for WP‑CLI JSON output in chat flows.
src/site-server.ts	Uses the new parser for theme-details JSON parsing.
src/lib/import-export/export/exporters/default-exporter.ts	Uses the new parser when fetching plugins/themes JSON during export.
src/lib/import-export/export/export-database.ts	Uses the new parser for sqlite tables --format=json output.

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[wpmobilebot]

📊 Performance Test Results

Comparing 87d0bd1 vs trunk

site-editor

Metric	trunk	87d0bd1	Diff	Change
load	2707.00 ms	2737.00 ms	+30.00 ms	⚪ 0.0%

site-startup

Metric	trunk	87d0bd1	Diff	Change
siteCreation	7079.00 ms	7095.00 ms	+16.00 ms	⚪ 0.0%
siteStartup	3923.00 ms	3931.00 ms	+8.00 ms	⚪ 0.0%

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Results are median values from multiple test runs.

Legend: 🟢 Improvement (faster) | 🔴 Regression (slower) | ⚪ No change (<50ms diff)

[sejas]

I was able to create a new site using PHP 8.5, I didn't spot any regression on that site.

Let’s add an entry to RELEASE-NOTES.txt to inform users that this new PHP version is now available.

I see one unit test failing.

[sejas]

What do you think about trying to parse the response first and then fallback into the custom parse if it fails?

Suggested change

	const objectStart = output.indexOf( '{' );
	try {
	return JSON.parse( output );
	} catch {
	// Fall through to extract JSON from mixed output
	}
	const objectStart = output.indexOf( '{' );

[epeicher]

I like that approach! I have updated it as part of 0212789. That will also include a better error message in case of non JSON detected