How to trigger an error inside a function and make it come from whereit was called?

function test1() {
trigger_error('My error');
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}
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application.php
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//code...
test1();
//code...
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I want the trigger_error to say the error came from application.php
and the line where it came from. I have a custom error handler, so if
some change on the error handler (or test1(), for that matter) is
needed, I will gladly do it.
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PHP does it, when you call any PHP function and it errors, it says it
came from the file that called it. In my own functions, it says it
came from the declaration... which is kind of useless because that is
what I already know... but when in the application it happened...
that's what's hard to find out.

http://ca.php.net/manual/en/language.exceptions.php
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On Jan 14, 3:08 am, Bruno Rafael Moreira de Barros
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<brunormbar...@gmail.comwrote:>>>>>

I want the trigger_error to say the error came from application.php
and the line where it came from. I have a custom error handler, so if
some change on the error handler (or test1(), for that matter) is
needed, I will gladly do it.
>

On 14 Jan, 11:08, Bruno Rafael Moreira de Barros
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<brunormbar...@gmail.comwrote:>
These *are* the parameters to the customer error handler.
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fromhttp://uk.php.net/manual/en/function.set-error-handler.php
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The third parameter is optional, errfile , which contains the
filename that the error was raised in, as a string.
The fourth parameter is optional, errline , which contains the line
number the error was raised at, as an integer.
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See also:http://uk.php.net/debug_backtrace
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C.

On Jan 14, 1:56 pm, "C. (http://symcbean.blogspot.com/)"
<colin.mckin...@gmail.comwrote:>
Yes, but the problem is, the error line and file equal to the ones
that lead you to the declaration of the function...

And you check the error log, all the errors will have come from the
same place, from inside test1(). But I tested try...catch and it
worked, and it even solved further problems I had.