Linux Journal: Web Database Applications with PHP and MySQL: A Book Review
Title: Web Database Applications with PHP and MySQLAuthor: Hugh E. Williams and David LanePublisher: O'Reilly & AssociatesISBN: 0596000413Price: $44.95 This book is subtitled Building Effective ...
When your first argument is null, they're basically the same except that the null coalescing won't output an E_NOTICE when you have an undefined variable. The PHP 7.0 migration docs has this to say: The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset (). It returns its first operand if it exists and is ...
In PHP, with systems where a user can login, it is not uncommon for an administrator to be able to impersonate another user for testing purposes. With the above example, if the user is not impersonating another user, and also a logged in user does not exist, then the user will be a guest user instead. Read on more if you don't understand this yet to see what ternaries are and how they are used ...
Note that the ; is redundant; as the answers suggest this short-tag expands to an echo with a semicolon added to the end, as per the php documents.
How can you connect to MySQL from the command line in a Mac? (i.e. show me the code) I'm doing a PHP/SQL tutorial, but it starts by assuming you're already in MySQL.
Also, MS allows for declares within any block in the procedure, unlike MySQL which requires all the DECLAREs at the top. While good on the command line, I feel using the set = @variable within stored procedures in MySQL is risky. There is no scope and variables live across scope boundaries.