debug_backtrace

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

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 52. 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__
typestring The current class type.
argsarray 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 276. debug_backtrace() example

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// filename: a.php
<?php

function a_test($str) {

   print "\nHi: $str";

   var_dump(debug_backtrace());
}

a_test('friend');
?>

// filename: b.php
<?php
include_once '/tmp/a.php';
?>

Results when executing /tmp/b.php:

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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"
 }
}

See also trigger_error() and print_debug_backtrace().

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