password needs rehash problem

password_needs_rehash.c

PHP_FUNCTION(password_needs_rehash)
{
    int hash_len, newAlgo, algo = 0;
    char *hash;
    HashTable *options = 0;
    zval **option_buffer;

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sl|H", &hash, &hash_len, &newAlgo, &options) == FAILURE) {
        RETURN_NULL();
    }
RETURN_LONG(hash_len);
    algo = php_password_determine_algo(hash, hash_len);

    if (algo != newAlgo) {
        RETURN_LONG(algo);
    }

    switch (algo) {
        case PHP_PASSWORD_BCRYPT:
            {
                int newCost = PHP_PASSWORD_BCRYPT_COST, cost = 0;

                if (hash_len < 60) {
                    php_error_docref(NULL TSRMLS_CC, E_WARNING, "Non well formed hash encountered");
                    RETURN_NULL();
                }

                if (options && zend_symtable_find(options, "cost", 5, (void **) &option_buffer) == SUCCESS) {
                    convert_to_long_ex(option_buffer);
                    newCost = Z_LVAL_PP(option_buffer);
                    zval_ptr_dtor(option_buffer);
                }

                sscanf(hash, "$2y$%d$", &cost);
                if (cost != newCost) {
                    RETURN_TRUE;
                }
            }
            break;
    }
    RETURN_FALSE;
}