PHP clean backtrace

backtrace.php

<?php

function backtrace()
{
    $backtrace = debug_backtrace();
    $log = "\n";
    $root = @$_SERVER['DOCUMENT_ROOT'];

    foreach ($backtrace as $trace) {
        $class = "";
        $type = "";
        extract($trace);
        if ($root && strpos($file, $root) === 0) {
            $file = substr($file, strlen($root));
        }
        $log .= "$file:$line\t${class}${type}${function}()\n";
    }

    return $log;
}

sample_backtrace.php

<?php

class Teste
{
    static function instance() {
        $t = new Teste();
        $t->foo();
    }

    function foo()
    {
        trigger_error(backtrace());
    }
}

function teste($a = 2)
{
    Teste::instance();
}

$f = function () {
    teste(45);
};

$f();