extract($this->_config['connection'] + array( 'database' => '', 'hostname' => '', 'username' => '', 'password' => '', 'socket' => '', 'port' => 3306, 'ssl' => NULL, ));
php default value assigned to the configuration array odd
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Origin www.cnblogs.com/hnhycnlc888/p/10982802.html
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