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debug_backtrace

(PHP 4 >= 4.3.0)

debug_backtrace -- Generates a backtrace

Description

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	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__
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"   } }

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