flatten parent exceptions

flatten_exceptions.php

<?php

function a() {
    throw new \LogicException('bad logic in A');
}

function b() {
    try {
        a();
    } catch (\LogicException $e) {
        throw new \RuntimeException('Runtime exception from B: ' . $e->getMessage(), 0, $e);
    }
}

function c() {
    b();
}

try {
    c();
} catch (\RuntimeException $e) {
    $messages = [];
    $exception = $e;
    do {
        $messages[] = sprintf(
            "%s was thrown with message: \"%s\"\r\n%s",
            get_class($exception),
            $exception->getMessage(),
            $exception->getTraceAsString()
        );
        $exception = $exception->getPrevious();
    } while ($exception !== null);

    echo implode("\r\n==========\r\n", $messages);
}

Will render:

RuntimeException was thrown with message: "Runtime exception from B: bad logic in A"
#0 /var/www/current/test.php(16): b()
#1 /var/www/current/test.php(20): c()
#2 {main}
==========
LogicException was thrown with message: "bad logic in A"
#0 /var/www/current/test.php(9): a()
#1 /var/www/current/test.php(16): b()
#2 /var/www/current/test.php(20): c()

The same approach \Symfony\Component\ErrorHandler\Exception\FlattenException::getAllPrevious()