PHP Manual
Prev |  | Next

# debug_backtrace

(PHP 4 >= 4.3.0, PHP 5)

debug_backtrace -- Generates a backtrace

## Description

array debug_backtrace ( void )

debug_backtrace() generates a PHP backtrace.

## Return Values

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

Table 1. 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).

## ChangeLog

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

## Examples

Example 1. debug_backtrace() example
`<?php // filename: a.php function a_test($str) { echo "\nHi: $str"; var_dump(debug_backtrace()); } a_test('friend'); ?> <?php // 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

trigger_error()
debug_print_backtrace()

Prev | Home | Next
Error Handling and Logging Functions | Up | debug_print_backtrace