What does the PHP debug_backtrace () function do?

Definition and Usage

The PHP debug_backtrace () function generates a backtrace (backtracking information).

The function returns an associative array. The following are the elements that might be returned:

Name	Type	Describe
function	String	The current function name.
Line	Integer	The current line number.
File	String	The current file name.
Class	String	The current class name
Object	Object	The current object.
Type	String	The current invocation type, which may be called: return: "--"-Method call Return: "::"-static method call Return Nothing-function call
Args	Array	If the function parameter is listed in the function. If in the referenced file, list the referenced file name.

Grammar

Debug_backtrace ()

Example

<?phpfunction One ($str 1, $str 2) {One ("Glenn", "quagmire");} function ($str 1, $str 2) {Three ("Cleveland", "Brown");} Function three ($str 1, $str 2) {Print_r (Debug_backtrace ());} One ("Peter", "Griffin");

Output:

Array (    [0] = = Array        (            [File] = D:\PHP\xampp\htdocs\52php\123\789.php [line] + =            7            [ Function] = three            [args]/= Array                (                    [0] = Cleveland                    [1] = Brown                )        )    [1] =& Gt Array        (            [File] = D:\PHP\xampp\htdocs\52php\123\789.php            [line] = 3            [function] =            [args] = Array                (                    [0] = Glenn                    [1] = Quagmire                )        )    [2] = = Array        (            [File] = D:\PHP\ xampp\htdocs\52php\123\789.php            [Line] = [            function] = one            [args] + Array                (                    [0 ] = Peter                    [1] = Griffin))        )

Debug_backtrace function Understanding 1

The Debug_backtrace function is to generate a backtrace.

The Debug_backtrace function returns an associative array.

1.backtrace how to understand;

2. Whether the associative array can be understood as being able to relate the new array to the original array;

Debug_backtrace Function Understanding 2

Parameters of the Debug_backtrace function

Functions: The current function name.

1. Whether the current function name is a custom function or a system function;

Line: The current row number.

Whether 1.line can be understood as the number of rows where the function is called;

File: the current filename.

1.file can be understood as the file where the current debugging is located

Class: The current category name

Object: The current object.

Type: The current invocation type, possibly called:

return: "--"-Method call

Return: "::"-static method call

Return Nothing-function call

1. How the invocation of various methods is understood;

Args[] Array If the function parameter is listed in the function. If in the referenced file, list the referenced file name.

Debug_backtrace function Understanding 3

<?php function One ($str 1, $str 2) {One (  "Glenn", "quagmire"), and  function one ($str 1, $str 2) {  three (" Cleveland "," Brown ");  } Function three ($str 1, $str 2) {  Print_r (Debug_backtrace ());  }  One ("Peter", "Griffin");?>

Output:

Array ([0] = = Array ([file] = = C:\wamp\www\web.php [line] = [function] = three [args] = Array ([0] = Cleveland [1] = Brown)) [1] = = Array ([file] = C:\wamp\www\web.php [line] [] [function] = wo [args] = Array ([0] = Glenn [1] = quagmire)) [2] = = Array ([file] + C:\wamp\www\web.php [line] = > 94 [function] = one [args] = Array ([0] = Peter [1] = Griffin)))