Why my YII need have installed Oracle's Instant Client libraries?

I am playing with Yii framework and now I am investigating Yii Shell. But if I use this command:

yiic shell

I always get this error message:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/oci8.so' - libclntsh.so.11.1: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_oci.so' - libclntsh.so.11.1: cannot open shared object file: No such file or directory in Unknown on line 0
libdc1394 error: Failed to initialize libdc1394
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/oci8.so' - libclntsh.so.11.1: cannot open shared object file: No such file or directory in Unknown on line 0
PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib64/php/modules/pdo_oci.so' - libclntsh.so.11.1: cannot open shared object file: No such file or directory in Unknown on line 0开发者_如何学Python
Error: index.php does not exist or is not an entry script file.

It is strange for me, because I am gonna to use only mySQL drivers, so why Oracle now? Any idea?

Many thanks for your replies!

Jakub

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Please install Oracle client and Open your php.ini, search for oci8.so and php_oci.so, in extensions section you should have something like extension=oci8.so and extension=pdo_oci.so, just comment it with ;. If You have extension=oci8_11g.so comment it as well"

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Open your php.ini, search for oci8.so and php_oci.so, in extensions section you should have something like extension=oci8.so and extension=pdo_oci.so, just comment it with ;. If You have extension=oci8_11g.so comment this as well