PHP debugging tool debug_print_backtrace()

If we want to know who called a certain method? debug_print_backtrace can solve it
debug_print_backtrace() can print out the calling process of a page, and it is clear where it comes from.
But this is a PHP5 Proprietary function, fortunately it has been implemented in pear,
http://pear.php.net/package/PHP_Compat

Test code

<?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");

Output result

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]

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