title: What does OPENSSL_RAW_DATA do?
body: <p>I'm pretty new to PHP encryption (and encryption in general) and I've been reading about using openssl_encrypt() function of PHP. </p>
  
  <p>There's an option to add a flag called OPENSSL_RAW_DATA. What does this actually do and where can I see how PHP uses this in the PHP source code?</p>