title: CDbConnection failed to open the DB connection: could not find driver in Yii
body: <p>while trying to connect with mysql in yii framework it shows </p>
  
  <p>"CDbConnection failed to open the DB connection: could not find driver " error</p>
  
  <p>php code :</p>
  
  <pre><code>     'db'=&gt;array(
          'class' =&gt; 'CDbConnection',
          'connectionString' =&gt; 'mysql:host=localhost:3306;dbname=testdrive',
          'emulatePrepare' =&gt; true,
          'username' =&gt; 'root',
          'password' =&gt; 'root',
          'charset' =&gt; 'utf8',
      ), 
  </code></pre>
  
  <p>my php drivers are already enabled , but it shows the same error</p>
  
  <p>Im using zend studio, zend server for this </p>
  
  <p>how could i fix this?</p>