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ioctl like function in php for sockets


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Is there any api function in php which whould tell how the length of packet recieved by the socket?
For example there is an api function in C linux which ioctl() which returns the length of the packet recieved by the socket.

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What i mean is  i dont want to hardcode the value in socket_read() or any socket api function.First i want to know the length of the data which the socket has recieved and accordingly i want to perform socket_read()  based on that length.

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