So you mean something like this?

    $nonce = sodium_crypto_generichash($message, '', 24);
    $ciphertext = $nonce . sodium_crypto_aead_xchacha20poly1305_ietf_encrypt(
        $message,
        $nonce,
        $nonce,
        $key
    );

That solves the literal search problem, but none of the others.

However, in my experience[1], when it comes to deterministic encryption, most PHP developers will use ECB mode, or CBC mode with a NULL IV.

[1]: https://meta.stackoverflow.com/q/293930/2224584