Error Handling Functions
PHP Manual


(PHP 4 >= 4.3.0, PHP 5)

debug_backtraceGenerates a backtrace


array debug_backtrace ([ bool $provide_object ] )

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
5.2.5 Added the optional parameter provide_object .
5.1.1 Added the current object as a possible return element.


Example #1 debug_backtrace() example

// filename: /tmp/a.php

function a_test($str)
"\nHi: $str";


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

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

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

Error Handling Functions
PHP Manual