Question

in file.php:

call()...

How to get absolute path of file.php inside call() ?

Pay attention that call() may be defined in another file.

another.php:

function call(){..}

file.php:

include(path_to_another.php);
call();

Answer 1

no way except debug_backtrace

function whatever() {
    $t = debug_backtrace();
    echo "called from {$t[0]['file']}";
}