What does this mean?

$page = $_GET['page'] ? $_GET['page'] : 1;

Code (markup):

 

Not sure what you mean?
What you have there is a ternary operator (basically a short version of an if/else statement).
However, it's not well formed.
You have a condition (if there is a $_GET['page'] then use the value, if there isn't, use 1). It's the same as writing

 
if ($_GET['page']) {
  $page = $_GET['page'];
} else{
  $page = 1;
}

Code (markup):

However, there's no check to see if the $_GET['page'] actually exist, so depending on error reporting, that will throw a warning.

Besides, with the new PHP versions, the simpler way would be:

 
$page = $_GET['page'] ?? 1;

Code (markup):

 

@PoPSiCLe Thanks for the detailed explanation. I too learnt something new! Thanks