I'm running Apache 2.4.7 with PHP 5.5.9 on Windows 8. I installed PHPUnit and this warning image "warning" started to pop up.
Yes I enabled extension loading in php.ini as well as "extension_dir" to correct folder and there is file named "php_pdo_oci.dll" in that folder. I tried to use different apache and php releases, but it didn't help. Any suggestions how to fix this?
The ..._oci.dll is part of the Oracle C Interface. Unless you need to use Oracle, I suggest you go to the relevant line inside the php.ini file and uncomment the loading of this extension. However, if you need to use this extension, you’ll need to install the free Oracle Client libraries and add them to the path.
Oracle has an article Installing PHP and the Oracle Instant Client for Linux and Windows on how to do this.
I currently have PHP version 7.1.9 and encountered this problem and resolved the issue. Just ensure these lines in your php.ini file are uncommented like so:
extension=php_fileinfo.dll
extension=php_ftp.dll
extension=php_gd2.dll
extension=php_gettext.dll
extension=php_gmp.dll
extension=php_intl.dll
extension=php_imap.dll
extension=php_interbase.dll
extension=php_ldap.dll
extension=php_mbstring.dll
extension=php_exif.dll ; Must be after mbstring as it depends on it
extension=php_mysqli.dll
extension=php_oci8_12c.dll ; Use with Oracle Database 12c Instant Client
extension=php_openssl.dll
extension=php_pdo_firebird.dll
extension=php_pdo_mysql.dll
extension=php_pdo_oci.dll
extension=php_pdo_odbc.dll
extension=php_pdo_pgsql.dll
extension=php_pdo_sqlite.dll
extension=php_pgsql.dll
extension=php_shmop.dll
Please restart your server application (IIS, Apache e.t.c.) after any changes to your php.ini file.
Please add below line in php.ini file
extension=pdo.so
extension=php_pdo.dll
extension=php_pdo_oci.dll
extension=php_pdo_oci8.dll
and restart apache server and check.
来源：https://stackoverflow.com/questions/22604780/php-unable-to-load-dynamic-library-php-pdo-oci-dll