Code explanation

[EJMAES1973]

Possible a stupid question, but is the following code like an if statement? The only parts that confuse me are the ? and : If anyone could explain that I would be grateful. Thank you.

(!empty($_GET['pn'])) ? preg_replace('/[^0-9]/', '', $_GET['pn']) : null ;

[tfk11]

It's similar yes.

If the expression preceding the question mark evaluates to true then the value of the expression after the question mark is returned else the value of the expression after the colon is returned.

true === (true) ? (true) : (false);

false === (false) ? (true) : (false);

[EJMAES1973]

Ok, Thank you. Does this have a specific name, or is it just kind of there?

[ZeroKilled]

is named as ternary conditional expression, however is commonly named as ternary operator. for more reference http://en.wikipedia.org/wiki/%3F:

[EJMAES1973]

Alright, thank you for the help.

[NogDog]

Also see the manual: http://www.php.net/ternary. (Scroll down 2-3 screens and you'll find the "Ternary Operator" heading.)