php部分自带扩展，在源码包里已有，不用再找第三方去下载：如 php_mysql, php_dblib等。

[root@test ext]# ls /usr/local/src/php-5.5.13/ext

bcmath fileinfo mbstring pdo_firebird shmop tokenizer

bz2 filter mcrypt pdo_mysql simplexml wddx

calendar ftp mssql pdo_oci skeleton xml

com_dotnet gd mysql pdo_odbc snmp xmlreader

ctype gettext mysqli pdo_pgsql soap xmlrpc

curl gmp mysqlnd pdo_sqlite sockets xmlwriter

date hash oci8 pgsql spl xsl

dba iconv odbc phar sqlite3 zip

dom imap opcache posix standard zlib

enchant interbase openssl pspell sybase_ct

ereg intl pcntl readline sysvmsg

exif json pcre recode sysvsem

ext_skel ldap pdo reflection sysvshm

ext_skel_win32.php libxml pdo_dblib session tidy