Pull request overview

This PR fixes a crash that occurred when a string was passed as the topics parameter to the mercure_publish() function. The fix corrects the type handling in the Go implementation to properly extract string values from PHP's zval structures.

Key changes:

• Updated the go_mercure_publish function signature to use proper C types (*C.zend_string) for string parameters
• Fixed the string topic extraction from zval structures using the established pattern from the codebase
• Added comprehensive tests covering both string and array cases for the topics parameter

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
mercure.go	Fixed function signature and type conversions; corrected zval string extraction for topics parameter
mercure_test.go	Added new test cases for mercure_publish with both module and worker modes
testdata/mercure-publish.php	Added test data demonstrating both string and array topic parameters
frankenphp_test.go	Extended test framework to support per-request options needed for Mercure hub configuration
testdata/flush.php	Removed extraneous blank line

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