我遇到过这种语法：var ==“”？ “ - ”：var。 有人可以解释一下吗？

Question

The code is this one:

$vendors[] = array(
    "id" => $row['vendorID'],
    "name" => $row['name'] == "" ? "-" : $row['name'],
    "tel1" => $row['phone1'] == "" ? "-" : $row['phone1'],
    "tel2" => $row['phone2'] == "" ? "-" : $row['phone2'],
    "mail" => $row['email'] == "" ? "-" : $row['email'],
    "web" => $row['web'] == "" ? "-" : $row['web']);

Can somebody explain me exactly what it is? Look like an Alternative syntax but I haven't managed to find infos.

Thanks you

Answer 1

This is a ternary operator:

The expression (expr1) ? (expr2) : (expr3) evaluates to expr2 if expr1 evaluates to TRUE, and expr3 if expr1 evaluates to FALSE.