feat: guard get_module export for statically linked extensions

[ptondereau]

Description

Closes #763.

A statically linked ext-php-rs extension always exported get_module, so it collided at link time with any other extension exporting the same symbol, like a C extension missing the #ifdef COMPILE_DL_ext guard. #[php_module] now also exports a crate-prefixed <crate>_get_module, and building with EXT_PHP_RS_STATIC_EXT=1 drops the unprefixed export while keeping the function callable from Rust. The static-glue shim calls the prefixed symbol, derived from the library target name rather than --ext-name. The variable replaces the unreleased EXT_PHP_RS_STATIC_TSRMLS_CACHE and also enables the static TSRMLS cache, so static builds need a single switch. Verified end to end on a two-pass PHP 8.5 ZTS build: linking next to an unguarded C extension failed with multiple definition of 'get_module' before, and links and runs with both modules loaded after. CI now asserts the symbol gating with nm on the hello_world cdylib.

Checklist

• I have read the contribution guidelines and the code of conduct.
• I have added tests that prove my code works as expected.
• I have added documentation if applicable.
• I have added a migration guide if applicable.

[ptondereau]

@TobiasBengtsson @okhoshi did my best, and some CI tests are ugly, but let's have some feedbacks

[coveralls]

Coverage Report for CI Build 32383225875

Coverage increased (+0.1%) to 66.98%

Details

• Coverage increased (+0.1%) from the base build.
• Patch coverage: 7 uncovered changes across 1 file (53 of 60 lines covered, 88.33%).
• 2 coverage regressions across 1 file.

Uncovered Changes

File	Changed	Covered	%
crates/cli/src/static_glue.rs	14	7	50.0%
Total (2 files)	60	53	88.33%

Coverage Regressions

2 previously-covered lines in 1 file lost coverage.

File	Lines Losing Coverage	Coverage
crates/cli/src/static_glue.rs	2	46.67%

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Coverage Stats

Relevant Lines:	13501
Covered Lines:	9043
Line Coverage:	66.98%
Coverage Strength:	43.0 hits per line

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💛 - Coveralls

[github-actions]

Bencher Report

Project	ext-php-rs
Branch	feat/guard-get-module-763
Testbed	PHP 8.4.24 (cli) (built: Jul 29 2026 09:44:18) (NTS)

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[okhoshi]

Looks good to me, I haven't tried yet however.

But thank you for jumping on so quickly 🚀