This API is the open version of MapQuest's Search API. Nominatim is completely open-source and is used to search all named features in OpenStreetMap and a subset of other unnamed features such as pubs and hotels. Results returned in Nominatim include the feature type, address, latitude/longitude, and other OSM data fields.
The following is a list of libraries from ProgrammableWeb's Library Directory that matched your search term. Although there many different interpretations of the word "library" among software developers, ProgrammableWeb adheres to a specific definition so as to clearly distinguish libraries from SDKs and frameworks in a way that will facilitate clean search results. In ProgrammableWeb's parlance, the term "library" is strictly used to describe a platform-specific software tool that, when installed, results in the provisioning a specific API. Conversely, SDKs are exclusively for consuming APIs and Frameworks are agnostic to specific APIs. If you think a library, SDK, API, or other asset is missing from our directory, be sure to check our guidelines for making contributions to ProgrammableWeb.
This PHP library aims to be the most functional geo-aware tool because it includes the providers of ArcGISOnline, GeoIP2, Google Maps, GoogleMapsBusiness, MaxMindBinary, Nominatim, TomTom, and Yandex. What this library provides is powerful abstraction layer for geocoding manipulations, according to the author. A complete guide to use the PHP library is available on William Durand's GitHub site.