unhandled errors in php

Question

How can I know during runtime that my code threw a Warning?

example

try {
    echo (25/0);
} catch (exception $exc) {
    echo "exception catched";
}

throws a "Warning: Division by zero" error that i can not handle on my code.

Answer 1

You're looking for the function set_error_handler(). http://ch.php.net/set_error_handler Check out the sample code in the manual.

Make sure that you don't only suppress the error warnings, but instead silently redirect them to a log file or something similar. (This helps you track down bugs)

Answer 2

You need to handle the exception yourself as follows.e.g

function inverse($x)
{
    if(!$x)
    {
         throw new Exception('Division by zero.');
    }
    else
    { 
        return 1/$x;
    }
}


try
{
     echo inverse(5);
     echo inverse(0);
}
catch (Exception $e)
{ 
    echo $e->getMessage();
}

Answer 3

You need to install an error handler that converts old style php "errors" into exceptions. See an example here