Question

Assuming I have a class like this:

class Database
{
    public static $hostname = 'localhost';
}

Is there any way to do this?

$createDatabaseQuery = "CREATE DATABASE IF NOT EXISTS Database::$hostname";

Currently I’m getting an error when trying to access the class from within the string and I’d like to avoid this:

$hostname = Database::$hostname;
$createDatabaseQuery = "CREATE DATABASE IF NOT EXISTS $hostname";

Answer 1

In double quotes you can only use “variable expressions”. They must always start with a $ or {$ to be interpreted. And you cannot access a class variable directly without a class qualifier.

The only workaround offerable is this:

 $Database = "Database";   // class name
 "CREATE DATABASE IF NOT EXISTS {$Database::$hostname}";

But that’s only a different kind of worse.

And this would be the “variable expression” alternative:

 $var = "mysql_real_escape_string";   // trick
 "CREATE DATABASE IF NOT EXISTS {$var(Database::$hostname)}";