php bug 调试助手 debug_print_backtrace()的介绍

<?php 
class a{ 
function say($msg) { 
echo "msg:".$msg; 
echo "<pre class="brush:php;toolbar:false">";debug_print_backtrace(); 
} 
} 

class b { 
function say($msg) { 
$a = new a(); 
$a->say($msg); 
} 
} 

class c { 
function __construct($msg) { 
$b = new b(); 
$b->say($msg); 
} 
} 

$c = new c("test");

<?php

function one($str1, $str2)
{
    two("Glenn", "Quagmire");
}

function two($str1, $str2)
{
    three("Cleveland", "Brown");
}

function three($str1, $str2)
{
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    debug_backtrace();
}
echo one(&#39;a&#39;,&#39;b&#39;);?>