PHP difference between \r\n and \n

Question

Simple question...

I have seen people tell me to use \"\\r\\n\" in various places and others tell me to use \"\\n\" in the same place. I\'m sure one is right and one

Answer 1

As per RFC 821 (the SMTP protocol), line endings should always be \r\n () in mail headers and content, but in practice it shouldn't matter as most mail servers handle all three type of line endings correctly (supposedly, some old UNIX-based ones actually choke on \r\n but not \n).