PHP debug_backtrace() function

Error at Logging Function ng PHP

Halimbawa

Gumawa ng PHP backtrace:

<?php
 function a($txt) {
     b("Glenn");
 }
 function b($txt) {
     c("Cleveland");
}
 function c($txt) {
     var_dump(debug_backtrace());
 }
 a("Peter");
 ?>

Ang output ng code na ito ay kahalintulad nang ito:

Array (
     [0] => Array (
         [file] => C:\webfolder\test.php
         [line] => 6
         [function] => c
         [args] => Array (
             [0] => Cleveland
         )
     )
     [1] => Array (
         [file] => C:\webfolder\test.php
         [line] => 3
         [function] => b
         [args] => Array (
             [0] => Glenn
         )
     )
     [2] => Array (
         [file] => C:\webfolder\test.php
         [line] => 11
         [function] => a
         [args] => Array (
             [0] => Peter
         )
     )
 )

Paggalaw at paglalarawan

Ang function na debug_backtrace() ay gumagawa ng backtrace (backtracking).

Ang function na ito ay nagpapakita ng datos na ginawa ng code ng function na debug_backtrace().

Makabintang ang isang korelatibong array. Ang posibleng mga elemento na maibabalik ay tulad nang ito:

Name Type Description
function string Current function name
line integer Current line number
file string Current file name
class string Current class name
object object Current object
type string

Current call type. Possible calls:

  • Returns: "->" - method call
  • Returns: "::" - static method call
  • Returns nothing - function call
args array If in a function, list function parameters. If in a referenced file, list the referenced file name.

Syntax

debug_backtrace(options,limit);
Parameter Description
options

Optional. Specify the bitmask for the following options:

  • DEBUG_BACKTRACE_PROVIDE_OBJECT (whether to fill the index of "object")
  • DEBUG_BACKTRACE_IGNORE_ARGS (whether to ignore the index of "args", including all function/method parameters, which can save memory overhead.)
limit Optional. Limit the number of stack frames returned. The default is (limit=0) Returns all stack frames.

Technical Details

Return Value: None
PHP Version: 4.3+
PHP Update Log

PHP 5.4: Added optional parameters limit.

PHP 5.3.6: Parameter provide_object Changed to optionsand added optional parameter DEBUG_BACKTRACE_IGNORE_ARGS.

PHP 5.2.5: Added optional parameters provide_object.

PHP 5.1.1: Added the current object For elements that may be returned.

Error at Logging Function ng PHP