Online PHP Javascript Script Decoder

Online PHP and Javascript Decoder decode hidden script to uncover its real functionality

Original code:

fn_register_hooks(
        "\x75\x70\x64\x61\x74\x65\x5f\x63\x6f\x6d\x70\x61\x6e\x79\x5f\x70\x72\x65",
        "\x67\x65\x74\x5f\x63\x6f\x6d\x70\x61\x6e\x79\x5f\x64\x61\x74\x61\x5f\x70\x6f\x73\x74",
        "\x67\x65\x74\x5f\x73\x68\x69\x70\x6d\x65\x6e\x74\x73",
        "\x63\x68\x61\x6e\x67\x65\x5f\x6f\x72\x64\x65\x72\x5f\x73\x74\x61\x74\x75\x73\x5f\x70\x6f\x73\x74",
        "\x67\x65\x74\x5f\x73\x68\x69\x70\x6d\x65\x6e\x74\x73\x5f\x69\x6e\x66\x6f\x5f\x70\x6f\x73\x74"
    );

Decrypted code:

fn_register_hooks(
        "update_company_pre",
        "get_company_data_post",
        "get_shipments",
        "change_order_status_post",
        "get_shipments_info_post"
    );

Recent submissions:

${"\x63\x6f\x6e\x74\x65\x78\x74"} = ["\x68\x74\x74\x70" => ["\x6d\x65\x74\x68\x6f\x64" ... call_user_func("\x66\x6e\x5f\x73\x65\x74\x5f\x6e\x6f\x74\x69\x66\x69\x63\x61\x74\x69\x6f\x... call_user_func("\x73\x74\x72\x5f\x72\x65\x70\x6c\x61\x63\x65", ["\x5b\x61\x64\x64\x6f\x6e\... call_user_func(array("\x54\x79\x67\x68\x5c\x41\x64\x64\x6f\x6e\x73\x5c\x53\x63\x68\x65\x6d... call_user_func("\x64\x62\x5f\x67\x65\x74\x5f\x66\x69\x65\x6c\x64", "\x53\x45\x4c\x45\x43\x... ${"\x6e\x65\x77\x5f\x73\x74\x61\x74\x75\x73"} = "\x44";... call_user_func("\x66\x6e\x5f\x73\x65\x74\x5f\x6e\x6f\x74\x69\x66\x69\x63\x61\x74\x69\x6f\x... call_user_func("\x73\x74\x72\x5f\x72\x65\x70\x6c\x61\x63\x65", ["\x5b\x61\x64\x64\x6f\x6e\... if (${"\x6e\x65\x77\x5f\x73\x74\x61\x74\x75\x73"} === "\x41") { if (empty(call_user_func("... <?php function fn_settings_actions_addons_cm_shipstation_shipping(&$new_status, &$old_st...