ask about onchange and onclick php

[eluser]C_Line[/eluser]
ooh, okay
but i have another problem
after my function called

i can't use php code like below ?
================================================================
<input onchange="here()" type = "text" name="aaa" />

[removed]
function here()
{
<?php
echo "asd"; /// <- this code
?&gt;
}

================================================================