gcc -shared -fPIC -o libmylib.so mylib.c  ; # 编译成为shared library

gcc -shared -o libmylib.so -Wl,--whole-archive libmylib.a \
  -Wl,--no-whole-archive libother.a

 cp libhello.so /usr/local/lib
 echo /usr/local/lib > /etc/ld.so.conf.d/local.conf
 /sbin/ldconfig

 string hello(int a)
 int hello_add(int a, int b)

./ext_skel --extname=myfunctions --proto=myfunctions.def

 PHP_ARG_ENABLE(myfunctions, whether to enable myfunctions support, 
 [ --enable-myfunctions        Include myfunctions support])

 ./buildconf --force  //生成新配置脚本
 './configure' '--prefix=/usr/local/php' '--with-libdir=lib64' '--enable-fpm' '--with-fpm-user=php-fpm' '--with-fpm-group=www--enable-mysqlnd' '--with-mysql=mysqlnd' '--with-mysqli=mysqlnd' '--with-pdo-mysql=mysqlnd' '--enable-opcache' '--enable-pcntl' '--enable-mbstring' '--enable-soap' '--enable-zip' '--enable-calendar' '--enable-bcmath' '--enable-exif' '--enable-ftp' '--enable-intl' '--with-openssl' '--with-zlib' '--with-curl' '--with-gd' '--with-zlib-dir=/usr/lib' '--with-png-dir=/usr/lib' '--with-jpeg-dir=/usr/lib' '--with-gettext' '--with-mhash' '--with-ldap' '--disable-fileinfo' '--with-config-file-path=/usr/local/php/etc' '--with-apxs2=/usr/local/httpd/bin/apxs' '--enable-myfunctions' // 配置

PHP_FE(hello_add, NULL)

PHP_FUNCTION(hello_add){ ... }

Extra_LDFLAG = -lhello //对应前面的libhello.so
Extra_libs = -lhello
(make clean)

make
make install

httpd -k restart