Quick try at composer.json file https://github.com/serbanghita/Mobile-Detect

gistfile1.json

{
    "name": "serbanghita/mobile-detect",
    "description": "Lightweight PHP class for detecting mobile devices",
    "keywords": ["mobile", "mobile detect", "mobile detector", "mobile device"],
    "homepage": "https://github.com/serbanghita/Mobile-Detect",
    "type": "library",
    "license": "MIT",
    "authors": [
        {
            "name": "Serban Ghita",
            "email": "serbanghita@gmail.com",
            "homepage": "http://ghita.org"
        }
    ],
    "require": {
        "php": ">=5.3.0"
    },
    "autoload": {
        "psr-0": {
            "Mobile_Detect": ""
        }
    }
}