例子

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

one("Peter", "Griffin");
?>  

輸出：

#0 three(Cleveland, Brown) called at [C:\webfolder\test.php:8]
#1 two(Glenn, Quagmire) called at [C:\webfolder\test.php:4]
#2 one(Peter, Griffin) called at [C:\webfolder\test.php:15]