wget http://cn2.php.net/distributions/php-5.4.38.tar.gz
tar zxf php-5.4.38.tar.gz
cd /ext/soap
find / -name phpize
/usr/bin/phpize

find / -name 'php-config'

./configure --with-php-config=/usr/bin/php-config --enable-soap

报错
 configure: error: xml2-config not found. Please check your libxml2 installation.
重新安装
 yum install libxml2
 yum install libxml2-devel -y

find / -name "xml2-config"

./configure --with-php-config=/usr/bin/php-config --enable-soap

echo $?

make && make install

完事出现
  Installing shared extensions:     /usr/lib64/php/modules/

vi /etc/php.ini
extension_dir = "/usr/lib64/php/modules/"
extension = "soap.so"

/etc/init.d/php-fpm reload

phpinfo();