How to learn PHP debug_backtrace()

Debug_backtrace function understanding 1

The function of debug_backtrace function is to generate a backtrace.

The debug_backtrace function returns an associative array.

1. How to understand backtrace;

2. Can associative arrays be understood as a new array that is related to the original array;

debug_backtrace function understanding 2

Parameters of debug_backtrace function

function: the current function name.

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

line: the current line number.

1. Can line be understood as the number of lines where the function is called?

file: the current file name.

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

class: the current class name

object: the current object.

type: current call type, possible calls:

Return: "->" - method call

Return: "::" - static method call

Return nothing - function call

1. How to understand the calls of various methods;

If the args[] array is in the function, List function parameters. If in a referenced file, list the referenced file name.

<?php 
function one($str1, $str2) { 
 two("Glenn", "Quagmire"); 
 } 
function two($str1, $str2) { 
 three("Cleveland", "Brown"); 
 } 
function three($str1, $str2) { 
 print_r(debug_backtrace()); 
 } 
 one("Peter", "Griffin");

Array ( [0] => Array ( [file] => C:\wamp\www\web.php [line] => 89 [function] => three [args] => Array ( [0] => Cleveland [1] => Brown ) ) 
[1] => Array ( [file] => C:\wamp\www\web.php [line] => 86 [function] => two [args] => Array ( [0] => Glenn [1] => Quagmire ) ) 
[2] => Array ( [file] => C:\wamp\www\web.php [line] => 94 [function] => one [args] => Array ( [0] => Peter [1] => Griffin ) ) )