debug_backtrace

(PHP 4 = 4.3.0)

debug_backtrace -- Generates a backtrace

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:

表格 1. Possible returned elements from debug_backtrace()

The current function name. See also __FUNCTION__.
The current line number. See also __LINE__.
The current file name. See also __FILE__.
The current class name. See also __CLASS__
The current class type.
If inside a function, this lists the functions arguments. If inside a included file, this lists the included file name(s).


The following is a simple example.

範例 1. debug_backtrace() example

// 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

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().