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

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

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.

It's what PHP insists on calling the "ternary operator" - see http://www.phpbuilder.com/manual/language.operators.comparison.php for syntax and example.

It means: if value is "" (empty), then set to "-" (hyphen), else set to whatever it is.

Just read a?b:c as «if a then b else c».

Yes, it is what the others say but it is not really recommended in terms of code readability. Use it with care and don't use it without brackets around the condition.

$myvar = ($condition == TRUE) ? $valueIfTrue : $valueIfFalse;

instead of

if ($condition)
{
    $myvar = $valueIfTrue;
}
else
{
    $myvar = $valueIfFalse;
}

You can also do this like "name" => $row['name'] == "" ?? "-"

i.e a == b ?? c so if a=b is true use a else use c