mySQL and php question

<?php
session_start();
return [
    'components' => [
        'db' => [
            'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=livecrm_livecrm2',
            'username' => 'livecrm_livecrm2',
            'password' => 'livecrm2',
            'charset' => 'utf8',


			/*
			 'class' => 'yii\db\Connection',
            'dsn' => 'mysql:host=localhost;dbname=yii2advanced',
            'username' => 'root',
            'password' => '',
            'charset' => 'utf8',
			*/
        ],
        'mailer' => [
            'class' => 'yii\swiftmailer\Mailer',
            'viewPath' => '@livefactory/mail',
            // send all mails to a file by default. You have to set
            // 'useFileTransport' to false and configure a transport
            // for the mailer to send real emails.
            'useFileTransport' => false ,
						'transport' => [
							'class' => 'Swift_SmtpTransport',
							'host' => $_SESSION['smtp_host'],
							'username' => $_SESSION['smtp_username'],
							'password' => $_SESSION['smtp_password'],
							'port' => $_SESSION['smtp_port'],
							'encryption' =>$_SESSION['smtp_encryption'],// 'ssl',
						],
        ],
    ],
];

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