A test file for use in comparing the behavior or `debug_backtrace` with a traditional debugger call stack.

a.php

<?php
// filename: a.php
// White space above was inserted to make debug_backtrace line numbers completely exclusive of each other.
class a_class
{
    static function a_function($str)
    {
        echo "<pre>";
        echo "#DB:debug_print_backtrace() running in [" . __FILE__ . ":" . __LINE__ . "]\n";
        debug_print_backtrace();
        echo "</pre>";
        echo "<br>";
        echo "</pre>";
        print("<pre>".print_r(debug_backtrace(),true)."</pre>");
    }
}

?>