goto without goto ;)

my-first-goto.php

<?php

function createFoo()
{
    $pdo = new PDO(/*...*/);
    $maxTryCount = 3;
    $tryCount = $maxTryCount;

    while ($tryCount > 0)
    {
        try {
            $key = createMyOwnUniqueKey(); // e.g. foo-ear62-re4it
            $stmt = $pdo->prepare('INSERT INTO foo (key) VALUES (:key)');
            $stmt->execute(array(':key' => $key));
            return new Foo(/*...*/);
        } catch (PDOException $e) {
            $tryCount--;
            
            if (!preg_match('Duplicate entry.*for key \'key\'', $e->getMessage())) {
                /* oh noes, we have a PDO exception, but it does NOT contain a Duplicate-Info ... so not worth a retry, DIE!! */
                throw new FooCreationException;
            }
        }
    }
    
    /* We tried it $maxTryCount */
    throw MyKeyIsNotReallyUniqueException('oh ein eichhörnchen. ich muss weg ...');
}