php 调试利器debug_print_backtrace()

如果我们想知道某个方法被谁调用了? debug_print_backtrace可以解决
debug_print_backtrace() 可以打印出一个页面的调用过程,从哪儿来到哪儿去一目了然.
不过这是一个PHP5的专有函数,好在pear中已经有了实现,
http://pear.php.net/package/PHP_Compat 测试代码
<div class="codetitle"><a style="CURSOR: pointer" data="12144" class="copybut" id="copybut12144" onclick="doCopy('code12144')"> 代码如下:<div class="codebody" id="code12144">
<?php
class a{
function say($msg) {
echo "msg:".$msg;
echo "

";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"); 
 
输出结果 
<div class="codetitle"><a style="CURSOR: pointer" data="3858" class="copybut" id="copybut3858" onclick="doCopy('code3858')"> 代码如下:<div class="codebody" id="code3858"> 
msg:test 
#0 a->say(test) called at [/var/www/test/test0723.php:12] 
#1 b->say(test) called at [/var/www/test/test0723.php:19] 
#2 c->construct(test) called at [/var/www/test/test0723.php:23] 
 
相关链接 http://ch2.php.net/manual/zh/function.debug-print-backtrace.php 
http://ch2.php.net/manual/zh/function.debug-backtrace.php
                        
（编辑：李大同）
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