# [PHP], 46 bytes

<!-- language-all: lang-php -->

    <?=array_sum(array_map(ord,str_split($argn)));

[Try it online!][TIO-jx4sopl4]

[PHP]: https://php.net/
[TIO-jx4sopl4]: https://tio.run/##fYxbb4IwAEb/SpkFWnHitsSJN6aCizHTLJrpIgodUyAg1LZ4S/zt7va@ty8553w0pNemSUMKIGFBClpgE6wFR5OpNRjhBtB1wKNtnhCxBj/WbR9EKc0FMNvfXYswRk4uz7fob20JRRn7LHHBXE6TSKDfW4xx43rd6XItTGl7Kp9M9TD6cC4lI2YzoFiGuhzCtJGUH8aasIuwWHa7Ky49xY7SS@r2@O6c1fjb0d53j73Mj92Bdp9VwWk9L1bmu7qYrDZYkh5bkoiNYbNa0G0v5shS4Rk61Y6vvUyVBV8s3XfkNQP55iD7M9XzlR22YKXQg6/Pm7bZgRE57P3SxTMk9D/9Ag "PHP – Try It Online"

No PHP answer on this yet, so here's the obvious one.

    $ echo Hello World!|php -F addascii.php
    1085