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PHP debug_backtrace() Function

PHP Error Reference Complete PHP Error Reference

Definition and Usage

The debug_backtrace() function generates a backtrace.

This function displays data from the code that led up to the debug_backtrace() function.

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

Name Type Description
function string The current function name
line integer The current line number
file string The current file name
class string The current class name
object object The current object
type string The current call type. Possible calls:
  • Returns: "->"  - Method call
  • Returns: "::"  - Static method call
  • Returns nothing - Function call
args array If inside a function, this lists the functions arguments. If inside an included file, this lists the included file name

Syntax

debug_backtrace()

Example

<?php
function one($str1, $str2)
  {
  two("Glenn", "Quagmire");
  }
function two($str1, $str2)
  {
  three("Cleveland", "Brown");
  }
function three($str1, $str2)
  {
  print_r(debug_backtrace());
  }

one("Peter", "Griffin");
?>

The output of the code above should be something like this:

Array
(
[0] => Array
  (
  [file] => C:\webfolder\test.php
  [line] => 7
  [function] => three
  [args] => Array
    (
    [0] => Cleveland
    [1] => Brown
    )
  )
[1] => Array
  (
  [file] => C:\webfolder\test.php
  [line] => 3
  [function] => two
  [args] => Array
    (
    [0] => Glenn
    [1] => Quagmire
    )
  )
[2] => Array
  (
  [file] => C:\webfolder\test.php
  [line] => 14
  [function] => one
  [args] => Array
    (
    [0] => Peter
    [1] => Griffin
    )
  )
)

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