How does one submit a transaction to the network using the blockchain.info API? I am currently working on a project which makes use of the blockchain.info api (php). Could anybody please tell me how to use this api to submit transactions to the network?
To broadcast Bitcoin transaction using blockchain.info you have to send a post request to https://blockchain.info/pushtx with tx=yourRawTransaction.

I would suggest you run your own node because you may face some rate limit.