问题
函数计算 php runtime 中的 php 版本为 7.2.7，php runtime 已经内置了较多的扩展，具体如下：
"Core", "date", "libxml", "openssl", "pcre", "zlib", "curl","filter", "hash", "readline", "Reflection",
"SPL", "session","xml", "standard", "mysqlnd", "bcmath", "bz2", "calendar","ctype", "dom", "mbstring",
"fileinfo", "ftp", "gettext", "gmp", "iconv","imagick", "json", "exif", "mysqli", "pcntl", "PDO",
"pdo_mysql","Phar", "posix", "protobuf", "redis", "shmop", "SimpleXML", "soap","sockets", "sysvmsg", "zip", "memcached",
"sysvsem", "sysvshm", "tokenizer", "xmlreader","xmlrpc", "xmlwriter", "Zend OPcache", "xdebug",但是还有用户具有其他扩展的需求，比如用户有对 php-gd 扩展的需求， 在本文中，以 php-gd 扩展为例， 我们讲解如果利用fcli 工具编译其他没有内置的扩展，php相关的扩展如下: php-ext
文章最后章节提供了编译好的扩展下载.
操作方法
简单，不需要额外底层库， 直接可以安装成功
~ tmp # fcli shell
Welcome to the function compute world. Have fun!
>>> sbox -t php7.2 -d code
Entering the container. Your code is in the /code direcotry.
Unable to find image 'aliyunfc/runtime-php7.2:build' locally
build: Pulling from aliyunfc/runtime-php7.2
...
root@c83d77cb373d:/code# docker-php-ext-install gd
Configuring for:
PHP Api Version: 20170718
Zend Module Api No: 20170718
Zend Extension Api No: 320170718
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking for a sed that does not truncate output... /bin/sed
checking for cc... cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
....
Installing shared extensions: /usr/local/lib/php/extensions/no-debug-non-zts-20170718/
Installing header files: /usr/local/include/php/
find . -name \*.gcno -o -name \*.gcda | xargs rm -f
find . -name \*.lo -o -name \*.o | xargs rm -f
find . -name \*.la -o -name \*.a | xargs rm -f
find . -name \*.so | xargs rm -f
find . -name .libs -a -type d|xargs rm -rf
rm -f libphp.la modules/* libs/*
root@c83d77cb373d:/code# ls /usr/local/lib/php/extensions/no-debug-non-zts-20170718/
bcmath.so dom.so gd.so iconv.so mysqli.so pdo_mysql.so redis.so soap.so sysvshm.so xmlrpc.so
bz2.so exif.so gettext.so imagick.so opcache.so phar.so session.so sockets.so tokenizer.so xmlwriter.so
calendar.so fileinfo.so gmp.so json.so pcntl.so posix.so shmop.so sysvmsg.so xdebug.so
ctype.so ftp.so hash.so mbstring.so pdo.so protobuf.so simplexml.so sysvsem.so xmlreader.so
root@c83d77cb373d:/code# cp /usr/local/lib/php/extensions/no-debug-non-zts-20170718/gd.so ./最后从sbox 命令中关联的code目录把 gd.so 提取出来， 然后参考：
php runtime 使用自定义扩展
复杂，需要额外底层库
root@fb4e2bc65410:/code# apt-get update
root@fb4e2bc65410:/code# apt-get install libsqlite3-dev
root@fb4e2bc65410:/code# docker-php-ext-install pdo_sqlite
root@fb4e2bc65410:/code# find / -name "pdo_sqlite.so"
/usr/local/lib/php/extensions/no-debug-non-zts-20170718/pdo_sqlite.so
root@fb4e2bc65410:/code# find / -name "*libsqlite3*"
/usr/lib/x86_64-linux-gnu/libsqlite3.so
/usr/lib/x86_64-linux-gnu/libsqlite3.la
/usr/lib/x86_64-linux-gnu/libsqlite3.a
/usr/lib/x86_64-linux-gnu/libsqlite3.so.0
/usr/lib/x86_64-linux-gnu/libsqlite3.so.0.8.6
...
root@fb4e2bc65410:/code# mkdir lib
root@fb4e2bc65410:/code# cp /usr/lib/x86_64-linux-gnu/libsqlite3* ./lib
root@fb4e2bc65410:/code# ls lib
libsqlite3.a libsqlite3.la libsqlite3.so libsqlite3.so.0 libsqlite3.so.0.8.6
root@fb4e2bc65410:/code# mkdir extension
root@fb4e2bc65410:/code# cp /usr/local/lib/php/extensions/no-debug-non-zts-20170718/pdo_sqlite.so ./extension/
root@fb4e2bc65410:/code# touch index.php
root@fb4e2bc65410:/code# ls -ll
total 0
drwxr-xr-x 3 root root 96 May 15 10:46 extension
-rw-r--r-- 1 root root 0 May 15 10:46 index.php
drwxr-xr-x 7 root root 224 May 15 10:45 lib