1、進入PHP安裝源碼包,找到ext下的ftp,進入
cd /home/local/php-5.6.25/ext/xml
2、/usr/local/php/bin/phpize
3、./configure --with-php-config=/usr/local/php/bin/php-config
4、make && make install
5、cp /usr/local/php/lib/php/extensions/no-debug-zts-20131226/xml.so /usr/local/php/extension/xml.so
vim /usr/local/php/etc/php.ini 添加 : extension=xml.so
6、重啟apache,/usr/local/apache/bin/apachectl restart
7、查看是否安裝成功:/usr/local/php/bin/php -m
找到xml說明成功