There are several payment methods available for e-commerce websites in PHP:

1. PayPal: PayPal is one of the most popular and widely used payment gateways. It allows customers to make payments using their PayPal account or credit/debit cards. PayPal provides an API that can be integrated into PHP applications to handle payment transactions.

2. Stripe: Stripe is another popular payment gateway that enables businesses to accept credit card payments online. It provides an API that can be integrated into PHP applications to handle payment transactions. Stripe also supports recurring payments, which is useful for subscription-based services.

3. Braintree: Braintree is a payment gateway owned by PayPal. It provides a seamless way to accept payments online, including credit/debit cards, PayPal, and digital wallets like Apple Pay and Google Pay. Braintree provides a PHP SDK that can be used to integrate payment processing into PHP applications.

4. Authorize.Net: Authorize.Net is a widely used payment gateway that allows businesses to accept credit card payments online. It provides an API that can be integrated into PHP applications to handle payment transactions. Authorize.Net also supports recurring payments and offers a wide range of features for managing payments.

5. 2Checkout: 2Checkout is a global payment platform that enables businesses to accept online payments from customers around the world. It supports various payment methods, including credit cards, PayPal, and local payment options. 2Checkout provides an API that can be integrated into PHP applications to handle payment transactions.

6. PayU: PayU is a leading online payment service provider that operates in multiple countries. It offers a range of payment solutions, including credit/debit cards, mobile wallets, and bank transfers. PayU provides a PHP SDK that can be used to integrate payment processing into PHP applications.

These are just a few examples of the payment methods available for e-commerce in PHP. It’s essential to choose a payment gateway that suits your specific business requirements and offers the required features and security. Also, ensure that the payment gateway you choose complies with relevant regulations and provides proper documentation and support for integration with PHP applications.