怪啦!今天的Apache和IIS都没法正确加载php_mysql.dll。google了一下，原来发现出现这个问题的人还不少，PHPstartup:Unabletoloaddynamiclibrary:E;\PHP5\ext\php_mysql.dll。明明php_mysql.dll就摆在extension_dir(="E:/PHP5/ext")下的嘛，怎么会呢?而且就在php_mysql.dll之前的extension=php_gd2.dll都没有出现这个问题，怪了!有人说copylibmysql.dll到%windir%\system32下就可以解决问题，其实"华山不这一条道"：
PHP被我挪了个窝，%ProgramFiles%到E:\下，导致一些要依赖于其他dll才能工作的扩展无法正常加载这些dll，出现加载扩展出
错，以刚才的php_mysql.dll为例，php_mysql依赖libmysql.dll，由于给PHP5挪窝了，而又没有把新的E:\PHP5夹道%PATH%中去
，所以没法找到这个libmysql.dll，才会出错。所以为了能够使用这些mysql的扩展，除了要正确地配置extension_dir外
，还得保证系统能够这些扩展所依赖的dll，解决的办法有两个：
1将这些依赖的dll拷贝到%windir%\system32下
2或者将PHP5的安装目录添加到%PATH%中。
无论那个都可以很好地达到我们地目的。
够简单的，但是有时候还就想不到哪儿去。
到底哪些扩展依赖哪些dll呢?以下列表可以帮助我们回答这个问题：
php_curl.dllCURL,ClientURLlibraryfunctionsRequires:libeay32.dll,ssleay32.dll(bundled)
php_domxml.dllDOMXMLfunctionsPHP<=4.2.0requires:libxml2.dll
(bundled)PHP>=4.3.0requires:iconv.dll(bundled)
php_fdf.dllFDF:FormsDataFormatfunctions.Requires:fdftk.dll
gnu_gettext.dll(bundled),PHP>=4.2.3requireslibintl-1.dll,
php_iconv.dllICONVcharactersetconversionRequires:iconv-1.3.dll
php_ingres.dllIngresIIfunctionsRequires:IngresIIlibraries
php_interbase.dllInterBasefunctionsRequires:gds32.dll(bundled)
php_java.dllJavafunctionsPHP<=4.0.6requires:jvm.dll(bundled)
php_ldap.dllLDAPfunctionsPHP<=4.2.0requireslibsasl.dll(bundled),
PHP>=4.3.0requireslibeay32.dll,ssleay32.dll(bundled)
php_mcrypt.dllMcryptEncryptionfunctionsRequires:libmcrypt.dll
php_mhash.dllMhashfunctionsPHP>=4.3.0requires:libmhash.dll(bundled)
php_mcrypt.dllMcryptEncryptionfunctionsRequires:libmcrypt.dll
php_mhash.dllMhashfunctionsPHP>=4.3.0requires:libmhash.dll(bundled)
php_msql.dllmSQLfunctionsRequires:msql.dll(bundled)
php_mssql.dllMSSQLfunctionsRequires:ntwdblib.dll(bundled)
php_mysql.dllMySQLfunctionsPHP>=5.0.0,requireslibmysql.dll(bundled)
php_mysqli.dllMySQLifunctionsPHP>=5.0.0,requireslibmysqli.dll(bundled)
php_oci8.dllOracle8functionsRequires:Oracle8.1+clientlibraries
php_openssl.dllOpenSSLfunctionsRequires:libeay32.dll(bundled)
php_oracle.dllOraclefunctionsRequires:Oracle7clientlibraries
php_sybase_ct.dllSybasefunctionsRequires:Sybaseclientlibraries
php_xmlrpc.dllXML-RPCfunctionsPHP>=4.2.1requires:iconv.dll(bundled)
php_xslt.dllXSLTfunctionsPHP<=4.2.0requiressablot.dll,expat.dll(bundled).
PHP>=4.2.1requiressablot.dll,expat.dll,iconv.dll(bundled).
看文档耐心不够，自己找了点麻烦。：P