Access Composer command line from your browser.
Clone this repository(or just download and move it) to some specific folder in your server (webcomposer folder, for example).
Access in the browser: http://example.com/webcomposer/index.php.
Provide user and password ( admin / w3bC0mp053R )
You should change the password of your file in the first lines of the index.php.
The script should download and install a local composer (This only happen once, be patience).
Wait for "Ready. All commands are available".
Right now, you can start typing your composer commands. Try help.
This script contains many flaws and vulnerabilities and should be treated as experimental.
Any improvement in this matter will be welcome.
Thanks to Manan Jadhav (CurosMJ) author of NoConsoleComposer that this script was based and still contain some fragments.