require_once(APATH.MAGEPATH.'/app/Mage.php');
umask(0);
Mage::app();

Fatal error: Uncaught exception 'Zend_Db_Adapter_Exception' with message 'The PDO extension is required for this adapter but the extension is not loaded' in
/home/inzana/public_html/Store/lib/Zend/Db/Adapter/Pdo/Abstract.php:342
Stack trace: #0 /home/inzana/public_html/Store/lib/Zend/Db/Adapter/Abstract.php(247): Zend_Db_Adapter_Pdo_Abstract->setFetchMode(2)
#1 /home/inzana/public_html/Store/app/code/core/Mage/Core/Model/Resource.php(165): Zend_Db_Adapter_Abstract->__construct(Array)
#2 /home/inzana/public_html/Store/app/code/core/Mage/Core/Model/Resource.php(110): Mage_Core_Model_Resource->_newConnection('pdo_mysql', Object(Mage_Core_Model_Config_Element))
#3 /home/inzana/public_html/Store/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(320): Mage_Core_Model_Resource->getConnection('core_write')
#4 /home/inzana/public_html/Store/app/code/core/Mage/Core/Model/Resource/Db/Abstract.php(350): Mage_Core_Model_Resource_Db_Abstract->_getConnection('write')
#5 /home/inzana/public_html/Store/app/code/core/Mage/Core/Model/R in /home/inzana/public_html/Store/lib/Zend/Db/Adapter/Pdo/Abstract.php on line 342

extension=pdo.so
extension=pdo_sqlite.so
extension=sqlite.so
extension=pdo_mysql.so

$ which php

if (!extension_loaded('pdo')) {
    /**
     * @see Zend_Db_Adapter_Exception
     */
    #require_once 'Zend/Db/Adapter/Exception.php';
    throw new Zend_Db_Adapter_Exception('The PDO extension is required for this adapter but the extension is not loaded');
}

ob_start();
phpinfo();
echo "n--------------------------------------------------n";
print_r($_SERVER);
$message = ob_end_clean();
file_put_contents('/tmp/no-pdo.log',"n",FILE_APPEND);

throw new Zend_Db_Adapter_Exception('The PDO extension is required for this adapter but the extension is not loaded');

echo 'Checking pdo extension installed or not';
echo '<pre/>';
extension_loaded ('PDO' ); // returns boolean

extension_loaded('pdo_mysql');

print_r(get_loaded_extensions());  exit();

[41] => PDO    [42] => pdo_sqlite    [43] => pdo_mysql