Although not a formal channel, you can also find a number of core developers on
the #php.pecl channel on [EFnet](http://www.efnet.org/). Similarly, many
documentation writers can be found on #php.doc.
+
+## PHP source code directory structure
+
+PHP source code also includes several files generated during development and
+several parts where maintenance is happening upstream in their respective
+locations.
+
+```bash
+<php-src>/
+ ├─ .git/ # Git configuration and source directory
+ └─ TSRM/ # Thread Safe Resource Manager
+ └─ m4/ # https://github.com/autoconf-archive/autoconf-archive
+ └─ ax_func_which_gethostbyname_r.m4
+ └─ ...
+ └─ Zend/ # Zend Engine
+ ├─ zend_language_scanner.c # Generated by re2c
+ ├─ zend_language_scanner_defs.h # Generated by re2c
+ ├─ zend_ini_scanner.c # Generated by re2c
+ ├─ zend_ini_scanner_defs.h # Generated by re2c
+ ├─ zend_vm_execute.h # Generated by `Zend/zend_vm_gen.php`
+ ├─ zend_vm_opcodes.c # Generated by `Zend/zend_vm_gen.php`
+ ├─ zend_vm_opcodes.h # Generated by `Zend/zend_vm_gen.php`
+ └─ ...
+ ├─ appveyor/ # Appveyor CI service files
+ └─ build/ # *nix build system files
+ ├─ ax_check_compile_flag.m4 # https://github.com/autoconf-archive/autoconf-archive
+ ├─ ax_gcc_func_attribute.m4 # https://github.com/autoconf-archive/autoconf-archive
+ ├─ libtool.m4 # https://git.savannah.gnu.org/cgit/libtool.git
+ ├─ shtool # https://www.gnu.org/software/shtool/
+ └─ ...
+ └─ ext/ # PHP core extensions
+ └─ bcmath/
+ ├─ libbcmath/ # Forked and maintained in php-src
+ └─ ...
+ └─ curl/
+ ├─ sync-constants.php # The curl symbols checker
+ └─ ...
+ └─ date/
+ └─ lib/ # Bundled datetime library https://github.com/derickr/timelib
+ ├─ parse_date.c # Generated by re2c 0.15.3
+ ├─ parse_iso_intervals.c # Generated by re2c 0.15.3
+ └─ ...
+ └─ ...
+ └─ fileinfo/
+ ├─ libmagic/ # Modified libmagic https://github.com/file/file
+ ├─ data_file.c # Generated by `ext/fileinfo/create_data_file.php`
+ ├─ libmagic.patch # Modifications patch from upstream libmagic
+ ├─ magicdata.patch # Modifications patch from upstream libmagic
+ └─ ...
+ └─ gd/
+ ├─ libgd/ # Bundled and modified GD library https://github.com/libgd/libgd
+ └─ ...
+ └─ json/
+ ├─ json_parser.tab.c # Generated by bison
+ ├─ json_parser.tab.h # Generated by bison
+ ├─ json_scanner.c # Generated by re2c
+ ├─ php_json_scanner_defs.h # Generated by re2c
+ └─ ...
+ └─ mbstring/
+ ├─ libmbfl/ # Forked and maintained in php-src
+ ├─ oniguruma/ # Bundled https://github.com/kkos/oniguruma
+ ├─ oniguruma.patch # Modifications patch from upstream oniguruma
+ ├─ unicode_data.h # Generated by `ext/mbstring/ucgendat/ucgendat.php`
+ └─ ...
+ └─ pcre/
+ ├─ pcre2lib/ # https://www.pcre.org/
+ └─ ...
+ └─ pdo/
+ ├─ pdo_sql_parser.c # Generated by re2c
+ └─ ...
+ └─ phar/
+ ├─ phar_path_check.c # Generated by re2c
+ └─ ...
+ └─ skeleton/ # Skeleton for developing new extensions with `ext/ext_skel.php`
+ └─ ...
+ └─ sqlite3/
+ ├─ libsqlite/ # https://www.sqlite.org mirror: https://github.com/mackyle/sqlite
+ └─ ...
+ └─ standard/
+ └─ html_tables/
+ ├─ mappings/ # https://www.unicode.org/Public/MAPPINGS/
+ └─ ...
+ ├─ credits_ext.h # Generated by `scripts/dev/credits`
+ ├─ credits_sapi.h # Generated by `scripts/dev/credits`
+ ├─ html_tables.h # Generated by `ext/standard/html_tables/html_table_gen.php`
+ ├─ url_scanner_ex.c # Generated by re2c
+ ├─ var_unserializer.c # Generated by re2c
+ └─ ...
+ └─ tokenizer/
+ ├─ tokenizer_data.c # Generated by `ext/tokenizer/tokenizer_data_gen.sh`
+ └─ ...
+ └─ xmlrpc/
+ ├─ libxmlrpc/ # Forked and maintained in php-src
+ └─ ...
+ └─ zend_test # For testing internal APIs. Not needed for regular builds.
+ └─ ...
+ └─ zip/ # Bundled https://github.com/pierrejoye/php_zip
+ └─ ...
+ └─ ...
+ └─ main/ # Binding that ties extensions, SAPIs, and engine together
+ ├─ streams/ # Streams layer subsystem
+ ├─ php_version.h # Generated by release managers using `configure`
+ └─ ...
+ ├─ pear/ # PEAR installation
+ └─ sapi/ # PHP SAPI modules
+ └─ cli/
+ ├─ mime_type_map.h # Generated by `sapi/cli/generate_mime_type_map.php`
+ └─ ...
+ └─ phpdbg/
+ ├─ phpdbg_lexer.c # Generated by re2c
+ ├─ phpdbg_parser.c # Generated by bison
+ ├─ phpdbg_parser.h # Generated by bison
+ └─ ...
+ └─ ...
+ ├─ scripts/ # php-config, phpize and internal development scripts
+ ├─ tests/ # Core features tests
+ ├─ travis/ # Travis CI service files
+ └─ win32/ # Windows build system files
+ ├─ cp_enc_map.c # Generated by `win32/cp_enc_map_gen.exe`
+ └─ ...
+ ├─ config.guess # https://git.savannah.gnu.org/cgit/config.git
+ ├─ config.sub # https://git.savannah.gnu.org/cgit/config.git
+ ├─ ltmain.sh # https://git.savannah.gnu.org/cgit/libtool.git
+ └─ ...
+```
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