PHP Curly bracket, what's meaning in this code

Question

I have this code (for getting a query from database, in MyBB source):

$query = "SELECT ".$fields." FROM {$this->table_prefix}{$table}";

My question is: What's meaning of {$table}? and what the difference between $table and {$table} (what's meaning of {})??

Thank you ...

Answer 1

The braces simply sequester the variable names from the rest of the text (and other variable names). Generally, this syntax is used for consistency's sake; it's sometimes necessary when you have variables that run into other letters, but many programmers use it all the time so that they never have to think about whether it's necessary.

See the documentation.