Print array contents in log file of magento

In Magento You can print your log in Exception.log using
Mage::logException($e->getMessage());
If you want to put the log to your custom log file, then you can use write below line
Mage::log('Your Query', Zend_Log::DEBUG, custom.log);
But the problem is that , It will not print any Array data, If you want to print Array data in to log file then you can use any one of the below method
Mage::getModel('core/log_adapter', 'custom.log')->log($arrayvariable);
or
Mage::log('Your Data :'.print_r($arrayvariable, true), Zend_Log::DEBUG, 'custom.log');