Pixabay is a website where users can browse through and download high quality photos, vector graphics and art illustrations that are all license free. Pixabay hosts a RESTful API interface for querying and retrieving these CC0 public domain images from Pixabay's directory of over 260,000 photos. The API can be accessed via HTTP address, and returns in JSON unicode. The API is limited to a maximum of 300 search results per query, and requires an API key for access.
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The Pixabay PHP SDK by Philipp allows API communication to implement image search features into applications. Usage example shows code to access the API with username and key. Code also demonstrates how to test the wrapper to obtain results.