Securely translate underscores into camel case

[michael2h4ng]

Gateway Alipay adopts underscore naming convention, and requires options like seller_email and return_url. Using only ucfirst() in the reflection function is not adequate, as it translates seller_email to getSeller_email, rather than getSellerEmail. This PR securely translates underscores into camel case.

[alexw23]

Wouldn't submitting a PR to Alipay repo be a better option by creating alias functions? Just an idea?

[michael2h4ng]

Not sure about this... since Alipay uses underscore heavily. @lokielse What do you think?

[lokielse]

'alipay_express'                => [
            'driver'  => 'Alipay_Express',
            'options' => [
                'partner'     => 'xxxx',
                'key'         => 'xxxxx',
                'sellerEmail' => 'xxxx@xx.com',
                'signType'    => 'MD5',
                'caCertPath'  => 'xxx',
                'returnUrl'   => 'xxx',
                'notifyUrl'   => 'xxxx',
            ]
        ],//

You should use camel case like sellerEmail in config file.

[michael2h4ng]

@lokielse Gotcha. Thanks.