PHP Print Call stack information

Wrong me in PHP, we use set_error_handler for processing, if an exception occurs, we use Set_exception_handler, but in debugging we can also use the

Debug_print_backtrace and Debug_backtrace Call stack information printing

Use of Set_error_handler

 My ERROR[$errno] $errstr
\ n ";        echo "Fatal error on line $errline in file $errfile"; echo ", PHP". Php_version. " (" . Php_os. ")
\ n "; echo "Aborting ...
\ n ";        Exit (1);    Break Case E_user_warning:echo "My WARNING[$errno] $errstr
\ n ";    Break Case E_user_notice:echo "My NOTICE[$errno] $errstr
\ n ";    Break Default:echo "Unknown error type: [$errno] $errstr
\ n ";    Break }/* Don ' t execute PHP Internal Error handler */return TRUE;} function to test the error handlingfunction Scale_by_log ($vect, $scale) {if (!is_numeric ($scale) | | $scale <= 0)    {Trigger_error ("log (x) for x <= 0 are undefined, you used:scale = $scale", e_user_error);        } if (!is_array ($vect)) {trigger_error ("Incorrect input vector, array of values expected", e_user_warning);    return null;    } $temp = Array (); foreach ($vect as $pos = + $value) {if (!is_numeric ($value)) {Trigger_error ("value at position $pos I            s not a number, using 0 (zero) ", e_user_notice);        $value = 0;    } $temp [$pos] = log ($scale) * $value; } return $temp;} $old _error_handler = Set_error_handler ("MyErrorHandler");? >

Use of Set_exception_handler

 Gettrace (); foreach ($trace as $key + $stackPoint) {//Returns an exception similar to the exception description information $trace [$key] [' args '] = Array_map (' GetType ', $tra    ce[$key [' args ']);    }//Format exception information $result = Array ();            foreach ($trace as $key = + $stackPoint) {$result [] = sprintf ($traceline, $key, $stackPoint [' file '], $stackPoint [' line '], $stackPoint [' function '], implode (', ', $stack    point[' args ')); }//Trace always ends with {main} $result [] = ' # '. + + $key.    ' {main} '; Write tracelines into main template $msg = sprintf ($msg, Get_class ($exception), $exception-&gt ; GetMessage (), $exception->getfile (), $exception->getline (), implode ("\ n", $result), $ex    Ception->getfile (), $exception->getline ()); Error_log ($msg);}? >

