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debug_backtrace

Generates a backtrace (PHP 4 >= 4.3.0, PHP 5)
array debug_backtrace ( )

debug_backtrace() generates a PHP backtrace.

Return Values

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

Table 82. Possible returned elements from debug_backtrace()

NameTypeDescription
functionstring The current function name. See also __FUNCTION__.
lineinteger The current line number. See also __LINE__.
filestring The current file name. See also __FILE__.
classstring The current class name. See also __CLASS__
objectobject The current object.
typestring The current call type. If a method call, "->" is returned. If a static method call, "::" is returned. If a function call, nothing is returned.
argsarray If inside a function, this lists the functions arguments. If inside an included file, this lists the included file name(s).


ChangeLog

VersionDescription
5.1.1 Added the current object as a possible return element.

Examples

Example 590. 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"
 }
}