Question

I am creating a login and want to allow my users to login either by username or email. How would I check if a string contains a letter, in this case @ so I can handle it correctly. Would I use strstr or strpos? Thanks!

Answer 1

You can use either. Since the @ should not appear at the start, you don’t even need the strpos result booleanization workaround.

If you want to assert that it’s a valid email address, then also try

filter_var($str, FILTER_VALIDATE_EMAIL)