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...ws_get_frame_info() - Gets information about an upcoming websockets frame
ws_read_frame() - Reads the data of a websockets frame from a client or server
ws_send_close() - Sends a close frame to the websockets peer
ws_send_ping() - Sends a ping frame to the websockets peer
ws_send_pong() - Sends a pong frame to the websockets peer
These functions are written in low level C so they are fast when compared with functions that are written in PHP, especially for operations like sending and receiving larger binary files.