官方下载的php安装包ext目录里以经包含了常用的php扩展，但某些情况下并不能满足我们项目需求，比如memcache扩展就不在官方的php安装包里。这时就需要我们自己去下载安装。
本文列出php官方提供的php扩展下载地址,及所有的扩展列表。
PHP 5.2/5.3的Windows扩展索引站点：
在这里你可以找到诸如php_oci8.dll, php_memcache.dll, php_mongo.dll, php_apc.dll等常用的Windows扩展dll文件，也能找到一些相对冷门但是也很实用的php扩展，如php_oauth.dll, php_solr.dll等扩展
http://downloads.php.net/pierre/
PHP 5.3/5.4/5.5的Windows扩展索引站点：
那么你就需要到下面这个站点来找扩展了, 该站点能下载到支持php5.4/5.5的pecl扩展，
http://windows.php.net/downloads/pecl/releases/
支持的扩展文件索引：
php_amqp.dll
php_aop.dll
php_apc.dll
php_apcu.dll
php_automap.dll
php_bbcode.dll
php_bitset.dll
php_blenc.dll
php_couchbase.dll
php_dbx.dll
php_dio.dll
php_docblock.dll
php_doublemetaphone.dll
php_excel.dll
php_fann.dll
php_fribidi.dll
php_gender.dll
php_geoip.dll
php_haru.dll
php_htscanner.dll
php_http.dll
php_ibm_db2.dll
php_igbinary.dll
php_imagick.dll
php_inclued.dll
php_jsmin.dll
php_jsonc.dll
php_judy.dll
php_libevent.dll
php_lzf.dll
php_mailparse.dll
php_memcache.dll
php_memoize.dll
php_memsession.dll
php_memtrack.dll
php_mongo.dll
php_msgpack.dll
php_mysqlnd_ms.dll
php_mysqlnd_qc.dll
php_oauth.dll
php_oci8.dll
php_opcache.dll
php_operator.dll
php_pdflib.dll
php_pdo_4d.dll
php_pdo_ibm.dll
php_pdo_informix.dll
php_pdo_sqlanywhere.dll
php_pdo_sqlsrv.dll
php_pthreads.dll
php_radius.dll
php_rar.dll
php_riak.dll
php_scream.dll
php_solr.dll
php_sphinx.dll
php_spl_types.dll
php_sqlsrv.dll
php_ssh2.dll
php_stats.dll
php_stem.dll
php_stomp.dll
php_taint.dll
php_trader.dll
php_translit.dll
php_txforward.dll
php_uploadprogress.dll
php_uri_template.dll
php_varnish.dll
php_vld.dll
php_weakref.dll
php_win32ps.dll
php_win32service.dll
php_wincache.dll
php_xdebug.dll
php_xdiff.dll
php_xhprof.dll
php_xrange.dll
php_xslcache.dll
php_yaf.dll
php_yaml.dll
php_zip.dll
php_zmq.dll