SFTP with PHP Sec Lib

sftp_phpseclib.php

<?php
// composer require phpseclib
include get_stylesheet_directory() . "/vendor/autoload.php";
use phpseclib\Net\SFTP;

function sftp() {
    $sftp = new SFTP( SFTP_HOST ); // Stored in wp-config.php (also 1Password)

    if ( !$sftp->login( SFTP_USER, SFTP_PW ) ) { // Stored in wp-config.php (also 1Password)
        throw new Exception( 'Login failed' );
    }
    if ( $sftp->file_exists( 'dir_name' ) ) { // check if dir exists
        $sftp->chdir( 'dir_name' ); // cd into dir
    }
    if ( $sftp->file_exists( 'file_name.zip' ) ) { // check if file exists
        $sftp->get( 'file_name.zip', wp_upload_dir()['basedir'] . '/file_name.zip' ); // download file to uploads base dir
    }
    // Unzip zip file
    try {
        unzip_file( wp_upload_dir()['basedir'] . '/file_name.zip', wp_upload_dir()['basedir'] . '/file_name.html' ); // unzip file and put contents somewhere
    } catch ( Exception $e ) {
        error_log( $e ); // error log if unsuccessful in unzipping
        return;
    }
}