How can I get around the lack of a finally block in PHP?

Question

PHP prior to version 5.5 has no finally block - i.e., whereas in most sensible languages, you can do:

try {
   //do something
} catch(Exception ex) {
   //ha         


        

Answer 1

function _try(callable $try, callable $catch, callable $finally = null)
{
    if (is_null($finally))
    {
        $finally = $catch;
        $catch = null;
    }

    try
    {
        $return = $try();
    }
    catch (Exception $rethrow)
    {
        if (isset($catch))
        {
            try
            {
                $catch($rethrow);
                $rethrow = null;
            }
            catch (Exception $rethrow) { }
        }
    }

    $finally();

    if (isset($rethrow))
    {
        throw $rethrow;
    }
    return $return;
}

Call using closures. Second parameter, $catch, is optional. Examples:

_try(function ()
{
    // try
}, function ($ex)
{
    // catch ($ex)
}, function ()
{
    // finally
});

_try(function ()
{
    // try
}, function ()
{
    // finally
});

Properly handles exceptions everywhere:

• $try: Exception will be passed to $catch. $catch will run first, then $finally. If there is no $catch, exception will be rethrown after running $finally.
• $catch: $finally will execute immediately. Exception will be rethrown after $finally completes.
• $finally: Exception will break down the call stack unimpeded. Any other exceptions scheduled for rethrow will be discarded.
• None: Return value from $try will be returned.