Errors and Logging
PHP Manual


(PHP 4 >= 4.3.0, PHP 5)

debug_backtrace — Generates a backtrace


array debug_backtrace ( void )

debug_backtrace() generates a PHP backtrace.

Return Values

Returns an associative array. The possible returned elements are as follows:

Possible returned elements from debug_backtrace()
Name Type Description
function string The current function name. See also __FUNCTION__.
line integer The current line number. See also __LINE__.
file string The current file name. See also __FILE__.
class string The current class name. See also __CLASS__
object object The current object.
type string The current call type. If a method call, "->" is returned. If a static method call, "::" is returned. If a function call, nothing is returned.
args array If inside a function, this lists the functions arguments. If inside an included file, this lists the included file name(s).


Version Description
5.1.1 Added the current object as a possible return element.


Example#1 debug_backtrace() example

// filename: a.php

function a_test($str)
"\nHi: $str";


// filename: b.php
include_once '/tmp/a.php';

Results similar to the following when executing /tmp/b.php:

Hi: friend array(2) { [0]=> array(4) { ["file"] => string(10) "/tmp/a.php" ["line"] => int(10) ["function"] => string(6) "a_test" ["args"]=> array(1) { [0] => &string(6) "friend" } } [1]=> array(4) { ["file"] => string(10) "/tmp/b.php" ["line"] => int(2) ["args"] => array(1) { [0] => string(10) "/tmp/a.php" } ["function"] => string(12) "include_once" } }

See Also

Errors and Logging
PHP Manual