Try: Reduce the C API to just phpwasm_run

[adamziel]

These explorations reduce the surface of the C API from ["_phpwasm_init_context", "_phpwasm_destroy_context", "_phpwasm_run", "_phpwasm_refresh", "_phpwasm_init_uploaded_files_hash", "_phpwasm_register_uploaded_file", "_phpwasm_destroy_uploaded_files_hash"] to just ["_phpwasm_run"]. This PR is draft-y, exploratory, and isn't meant for merging. It's just my way of sharing some thoughts in public.

The changes proposed mostly work, however this problem is blocking:

018c5aa6:0x48482c Uncaught (in promise) RuntimeError: memory access out of bounds
    at dlfree (018c5aa6:0x48482c)
    at zend_hash_destroy (018c5aa6:0x2700c2)
    at destroy_uploaded_files_hash (018c5aa6:0x1226b9)
    at sapi_deactivate (018c5aa6:0x1250a2)
    at invoke_v (php-8.0.js?159776a7a8ad4cc94cd1fc412c1de07ac89eb96850a44a8c81a9fb25fb4e1b0c:6865:29)
    at php_request_shutdown (018c5aa6:0x1aeaf1)
    at php_embed_shutdown (018c5aa6:0x276e89)
    at invoke_v (php-8.0.js?159776a7a8ad4cc94cd1fc412c1de07ac89eb96850a44a8c81a9fb25fb4e1b0c:6865:29)
    at phpwasm_run (018c5aa6:0x2eac19)
    at Object.ccall (php-8.0.js?159776a7a8ad4cc94cd1fc412c1de07ac89eb96850a44a8c81a9fb25fb4e1b0c:6350:22)

More prominently, there's a problem of shaping the API:

• Parsing the request in PHP would mean reimplementing methods already provided by the browser, and deriving again the same informatino JS already has readily avialable.
• Not parsing the request in PHP means JavaScript needs to re-serialize the parsed raw data to populate php://input. JS could reuse the raw request data, but that would potentially process large multipart-encoded files twice.

I'm not sure what's the best way to proceed yet.

[adamziel]

Closing in favor of #107