core/Common.php and loginmodel.php issues

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When launching->
A PHP Error was encountered Severity: Notice Message: Only variable references should be returned by reference Filename: core/Common.php Line Number: 257

When trying to log ->
Fatal error: Call to a member function num_rows() on boolean in D:\xampp\htdocs\procurementSys\application\models\login_model.php on line 19

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Core/Common.php -> SOLUTION

Edit filename: core/Common.php, line number: 257

Before

return $_config[0] =& $config;

After

$_config[0] =& $config; return $_config[0];

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Fatal error: Call to a member function num_rows() on boolean in YOURPATH\procurementSys\application\models\login_model.php on line 19 -> SOLUTION

switch to Mysqli or PDO.

in config/database.php -> goto -> $db['default']['dbdriver'] = 'mysql'; replace by ->$db['default']['dbdriver'] = 'mysqli';