No, because your goal is to run PHP quickly, while php-src is the interpreter source repository rather than a ready-to-use application package.

• The README explicitly recommends prebuilt packages and binaries for getting started quickly; on Windows, binaries are available from windows.php.net and the extracted *.exe files are ready to use.
• A Git source build requires at least autoconf, bison, and re2c; the default build additionally requires libxml2 and libsqlite3. That conflicts with your constraint of avoiding a compiler toolchain.
• Project data identifies C as the main language and lists php-8.5.12 as the latest release, showing that this repository focuses on runtime implementation rather than websites or business libraries.
• Even after installation, database drivers, a web server, and framework-level features are not supplied as a complete application stack by the core repository.

Yes, because the README directly provides commands for the full suite, directory filtering, and parallelism control, matching each part of your CI constraint.

• After a successful compilation, make test runs PHP’s extensive built-in test suite and can serve as the full-suite stage.
• Tests run in parallel by default, using up to 10 detected logical processors; TEST_PHP_ARGS=-j4 limits the parallel worker count to four.
• The README also supports make TESTS=tests/lang/ test, which directly restricts execution to the language-behavior directory.
• Sequential execution is available with -j1 if the CI job requires it. However, the README does not describe result formats, retry behavior, platform isolation, or how external dependencies affect test outcomes; those aspects remain part of the CI design.

Yes, because the project provides a debug-oriented --enable-debug build and connects source compilation, testing, and contribution workflows.

• Project data identifies C as the main language, with far more code than PHP, C++, Shell, or M4, which matches work on the interpreter core.
• The README explicitly recommends --enable-debug for development and documents the ./buildconf, configure, and make sequence.
• After compilation, make test runs the test suite. Tests run in parallel by default, and TESTS can limit execution to a directory such as tests/lang/ for language behavior.
• New language features require an RFC accepted by the developers, while bug fixes do not require an RFC. Runtime fixes and language-design changes therefore follow different contribution paths.

Yes, because the README provides Ubuntu dependencies, production configuration, and build steps, including the libraries needed for the default build with libxml2 and SQLite.

• The Ubuntu dependency command includes pkg-config build-essential autoconf bison re2c libxml2-dev libsqlite3-dev, matching the target platform and extension requirements.
• The README identifies ./configure as the production configuration and reserves ./configure --enable-debug for development, allowing the runtime image and debug build to be separated.
• The build supports make -j4, and the README says the job count should usually match the available CPU cores.
• After testing, make install can install the result, although permissions and the installation prefix may require superuser access. The README does not automatically resolve conflicts with an existing PHP binary or extension path in the image.

Yes, but you will need separate platform build paths because the README provides entry points for Windows, Linux, and macOS without promising identical dependencies or configurations across them.

• The README links to a dedicated Windows build guide, provides Ubuntu and Fedora dependency commands for Linux, and documents Homebrew and MacPorts options for macOS.
• The core is implemented primarily in C, while Autoconf and Make provide configurable builds that can adapt to platforms, libraries, and debug requirements.
• The project supports both prebuilt binaries and source builds, allowing a distribution to use the source as upstream while delivering compiled packages to ordinary users.
• make test can be included in each platform’s validation process, but the README does not list the compiler matrix, platform-specific differences, or every extension combination. Cross-platform consistency therefore cannot be guaranteed by the core source alone.

It depends, because the README covers macOS source dependencies and PHP’s extension model, but it does not guarantee that every third-party extension will work with every configuration.

• On macOS, Homebrew can install autoconf bison re2c libiconv libxml2 sqlite, or the corresponding dependencies can be installed with MacPorts, satisfying the documented source-build prerequisites.
• The README says extensions provide additional functionality on top of PHP and points to the PIE Extensions list for additional extensions. This supports an extension-based design, but does not mean every extension ships in the core repository.
• The test suite runs with make test, and TESTS can select a directory, allowing targeted validation where tests exist.
• The README does not detail the API compatibility, build flags, test directories, or third-party library versions for a particular extension. Those details require the extension’s documentation or internal documentation.