Fix GH-16357: openssl may modify member types of certificate arrays

We must not use `try_convert_to_string()` on members of unseparated
array arguments; instead of separating, we use `zv

Fix GH-16357: openssl may modify member types of certificate arrays

We must not use `try_convert_to_string()` on members of unseparated
array arguments; instead of separating, we use `zval_try_get_string()`.

Closes GH-16370.

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