Php debug backtrace () function

Write your php code

(PHP 4 >= 4.3.0, PHP 5)

debug_backtrace -- Generates a backtrace

Syntax

array debug_backtrace ( void )

debug_backtrace() generates a PHP backtrace and returns this information as an associative array. The possible returned elements are listed in the following table:

Table 1. Possible returned elements from debug_backtrace()

Name	Type	Syntax
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__
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).

The following is a simple example.

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 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"
  }
}

Php debug backtrace Function syntax tag

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Php debug backtrace syntax tutorial

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