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<?php
    // 此函数可以打印出 当前所在函数被哪些函数调用
    function print_stack_trace()
    {
        $html = "";
        $array = debug_backtrace();
        unset($array[0]);
        foreach($array as $row)
        {
           $html .=$row['file'].':'.$row['line'].'行,调用方法:'.$row['function']."<p>";
        }
        echo $html;
    }
    
    //这是更简洁的方式
    $e = new Exception;  
    var_dump($e->getTraceAsString());