Is there any way to show, or throw, a PHP warning?

Question

I have a select() method in a database class, that has an optional boolean argument $sum. This argument is used to say if the method should or not use COUNT(*) too.

I would like to show a warning, like those normal PHP errors, if I try to access class->sum if the attribute is not set (i.e. when I call select() with $sum = false.

Is there any way to show a warning like this, or I should just echo an error and be happy?

Answer 1

You could try trigger_error()

Answer 2

You're going the object-oriented approach, so I suggest a look into exceptions.