Try a callable a number of times

retry.php

<?php

/**
 * Try a callable a number of times.
 * If all attempts fail, handle a catch and/or finally.
 * If no catch is provided, just throw the exception from the last failed attempt.
 * If an attempt succeeds, return the number of attempts (at least one).
 * If the provided number of attempts is zero or less, the code won't attempt to run at all.
 *
 * This is a quick hack, which can easily be improved and most likely still has issues.
 */
function retry($attempts, callable $try, callable $catch = null, callable $finally = null) {
    $attempt = 1;
    
    while ($attempt <= $attempts) {
        try {
            $try();
        } catch (Throwable $throwable) {
            $attempt++;       
            if ($attempt > $attempts) {
                $catch && $catch($throwable);
                $finally && $finally();
                if (!$catch) {
                    throw $throwable;
                }
                return false;
            }
        }
    }
    
    $finally && $finally();
    
    return $attempt;
}

$a = 0;
retry(3, function() use (&$a) {
    ++$a;
    throw new Exception('foobar:' . $a);
}, function(Throwable $e) {
    var_dump($e);
});