log4php + PHP 7 - catching and logging Throwable - php

Question

I am having trouble logging a "TypeError" with log4php. I suspect this is because I recently upgraded from php 5.5 to 7.1.
Usually, my syntax looks like this:
<?
use Logger;
class MyClass
{
/** #var Logger */
private $logger;
function __construct(array $configParams)
{
Logger::configure('logger.xml');
$this->logger = Logger::getLogger(__CLASS__);
}
public function dostuff()
{
try
{
// ...
}
catch (Exception $ex)
{
$this->logger->error("ERROR CAUGHT", $ex);
}
}
}
?>
The above syntax will print lots of info to the log file, including a stack trace. However after reading the latest php7 docs, I believe I'm meant to handle the \Throwable interface, in order to catch both errors and exceptions (which is great). So I replace the above catch with the following:
catch (\Throwable $ex)
This still prints stack-trace information for my exceptions, but when a "TypeError" is caught, nothing gets printed to the log file.
I assume that this is due to log4php not knowing how to log errors. How can I log errors using log4php in a universal way?
Thanks,

Answer 1

I think you should use $ex->getMessage() for error() method your code should be
catch (Exception $ex)
{
$this->logger->error("ERROR CAUGHT", $ex->getMessage());
}
For logging trace you should use trace
catch (Exception $ex)
{
$this->logger->trace("ERROR CAUGHT", $ex);
}

Answer 2

Try to fix this
$this->logger->error("ERROR CAUGHT", $ex);
with
$this->logger->error("ERROR CAUGHT : " . $ex->getMessage());
log4php's documentation says that error method has just one parameter.

Answer 3

It took me a while to figure out why the original file name and line number was not logged by log4php when an exception is thrown. It turned out that my custom exception_handler class was only logging the exception message (by doing $exception->getMessage()), which does not contain the file name nor the line number. All I to do is concatenate that info: $exception->getFile() and $exception->getLine():
public function exception_handler ($exception) {
$logger = Logger9::create();
$logger->info($exception->getMessage()." ".$exception->getFile()." ".$exception->getLine());
}
Don't forget to register the custom handler:
#set_exception_handler(array($this, 'exception_handler'));