php 調試利器debug_print_backtrace()_php技巧

如果我們想知道某個方法被誰調用了? debug_print_backtrace可以解決
debug_print_backtrace() 可以列印出一個頁面的調用過程 , 從哪兒來到哪兒去一目瞭然.
不過這是一個PHP5的專有函數,好在pear中已經有了實現,
http://pear.php.net/package/PHP_Compat

測試代碼

複製代碼 代碼如下:

<?php
class a{
function say($msg) {
echo "msg:".$msg;
echo "<pre>";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");

輸出結果

複製代碼 代碼如下:

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]

相關連結

http://ch2.php.net/manual/zh/function.debug-print-backtrace.php
http://ch2.php.net/manual/zh/function.debug-backtrace.php