怪啦!今天的Apache和IIS都沒法正確加載php_mysql.dll。google了一下，原來發現出現這個問題的人還不少，PHP startup: Unable to load dynamic library :E;/PHP5/ext/php_mysql.dll。明明php_mysql.dll就擺在extension_dir (= "E:/PHP5/ext")下的嘛，怎么會呢?而且就在php_mysql.dll之前的extension=php_gd2.dll都沒有出現這個問題，怪了!有人說copy libmysql.dll到 %windir%/system32下就可以解決問題，其實"華山不這一條道"：

PHP被我挪了個窩，%ProgramFiles%到E:/下，導致一些要依賴于其他dll才能工作的擴展無法正常加載這些dll，出現加載擴展出

錯，以剛才的php_mysql.dll為例，php_mysql依賴libmysql.dll，由于給PHP5挪窩了，而又沒有把新的E:/PHP5夾道%PATH%中去

，所以沒法找到這個libmysql.dll，才會出錯。所以為了能夠使用這些mysql的擴展，除了要正確地配置extension_dir外

，還得保證系統能夠這些擴展所依賴的dll，解決的辦法有兩個：

1 將這些依賴的dll拷貝到%windir%/system32下

2 或者將PHP5的安裝目錄添加到%PATH%中。

無論那個都可以很好地達到我們地目的。

夠簡單的，但是有時候還就想不到哪兒去。

到底哪些擴展依賴哪些dll呢?以下列表可以幫助我們回答這個問題：

php_curl.dll CURL, Client URL library functions Requires: libeay32.dll, ssleay32.dll (bundled)

php_domxml.dll DOM XML functions PHP <= 4.2.0 requires: libxml2.dll

(bundled) PHP >= 4.3.0 requires: iconv.dll (bundled)

php_fdf.dll FDF: Forms Data Format functions. Requires: fdftk.dll

gnu_gettext.dll (bundled), PHP >= 4.2.3 requires libintl-1.dll,

php_iconv.dll ICONV characterset conversion Requires: iconv-1.3.dll

php_ingres.dll Ingres II functions Requires: Ingres II libraries

php_interbase.dll InterBase functions Requires: gds32.dll (bundled)

php_java.dll Java functions PHP <= 4.0.6 requires: jvm.dll (bundled)

php_ldap.dll LDAP functions PHP <= 4.2.0 requires libsasl.dll(bundled),

PHP >= 4.3.0 requires libeay32.dll,ssleay32.dll (bundled)

php_mcrypt.dll Mcrypt Encryption functions Requires: libmcrypt.dll

php_mhash.dll Mhash functions PHP >= 4.3.0 requires: libmhash.dll (bundled)

php_mcrypt.dll Mcrypt Encryption functions Requires: libmcrypt.dll

php_mhash.dll Mhash functions PHP >= 4.3.0 requires: libmhash.dll (bundled)

php_msql.dll mSQL functions Requires: msql.dll (bundled)

php_mssql.dll MSSQL functions Requires: ntwdblib.dll (bundled)

php_mysql.dll MySQL functions PHP >= 5.0.0, requires libmysql.dll (bundled)

php_mysqli.dll MySQLi functions PHP >= 5.0.0, requires libmysqli.dll (bundled)

php_oci8.dll Oracle 8 functions Requires: Oracle 8.1+ client libraries

php_openssl.dll OpenSSL functions Requires: libeay32.dll (bundled)

php_oracle.dll Oracle functions Requires: Oracle 7 client libraries

php_sybase_ct.dll Sybase functions Requires: Sybase client libraries

php_xmlrpc.dll XML-RPC functions PHP >= 4.2.1 requires: iconv.dll (bundled)

php_xslt.dll XSLT functions PHP <= 4.2.0 requires sablot.dll, expat.dll (bundled).

PHP >= 4.2.1 requires sablot.dll, expat.dll, iconv.dll (bundled).

看文檔耐心不夠，自己找了點麻煩。：P