(PHP 4 >= 4.3.0, PHP 5)
debug_backtrace — Generates a backtrace
$options
= DEBUG_BACKTRACE_PROVIDE_OBJECT
[, int $limit
= 0
]] )debug_backtrace() generates a PHP backtrace.
options
As of 5.3.6, this parameter is a bitmask for the following options:
DEBUG_BACKTRACE_PROVIDE_OBJECT | Whether or not to populate the "object" index. |
DEBUG_BACKTRACE_IGNORE_ARGS | Whether or not to omit the "args" index, and thus all the function/method arguments, to save memory. |
TRUE
or FALSE
, which are the same as
setting or not setting the DEBUG_BACKTRACE_PROVIDE_OBJECT
option respectively.
limit
As of 5.4.0, this parameter can be used to limit the number of stack frames returned.
By default (limit
=0) it returns all stack frames.
Returns an array of associative arrays. The possible returned elements are as follows:
Name | Type | Description |
---|---|---|
function | string | The current function name. See also __FUNCTION__. |
line | integer | The current line number. See also __LINE__. |
file | string | The current file name. See also __FILE__. |
class | string | The current class name. See also __CLASS__ |
object | object | The current object. |
type | string | The current call type. If a method call, "->" is returned. If a static method call, "::" is returned. If a function call, nothing is returned. |
args | array | If inside a function, this lists the functions arguments. If inside an included file, this lists the included file name(s). |
Version | Description |
---|---|
5.4.0 |
Added the optional parameter limit .
|
5.3.6 |
The parameter provide_object changed to options and additional option
DEBUG_BACKTRACE_IGNORE_ARGS is added.
|
5.2.5 |
Added the optional parameter provide_object .
|
5.1.1 | Added the current object as a possible return element. |
Example #1 debug_backtrace() example
<?php
// filename: /tmp/a.php
function a_test($str)
{
echo "\nHi: $str";
var_dump(debug_backtrace());
}
a_test('friend');
?>
<?php
// filename: /tmp/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" } }