how repremand line array controlling trigger_error php?

i am controlling trigger_error "throw" errors tradition class. problem trigger_error prints out line array where trigger_error called. example, given following code:

01    <?php
02        category exam {
03            duty doaction() {
04                $this->dosubaction();
05            }
06            
07            duty dosubaction() {
08                if(true)
09                    trigger_error('custom error', e_user_warning);
10            }
11        }
12        
13        $var = new test();
14        $var->doaction();
15    ?>

php imitation out following:

warning: tradition blunder test.php line 9

how php relapse line where doaction() duty called (the slight called outmost class, ignoring calls finished internally) follows?

warning: tradition blunder test.php line 14

edit: run-down instance something bit closer i'm perplexing achieve.