# PHP debug_print_backtrace() 函數 ## 定義和用法 debug_print_backtrace() 函數輸出 backtrace。 ### 語法 ``` debug_print_backtrace() ``` ## 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] ```