PHP Socket Read/Socket Receive

Question

What's the difference between socket_read and socket_recv? I'm trying to use PHP sockets but I get this warning using socket_read:

socket_read(): unable to read from socket [10057]

This is the line of coding for that:

$strData = socket_read($resSock, 65536, PHP_BINARY_READ);

Now when I use socket_recv, I get this warning:

socket_recv(): unable to read from socket [0]

And this is the line:

socket_recv($resSock, $strData, 65536, 0);

Please help me out here!

Since both functions are getting the same error, why does the difference between them matter? — Barmar
– Barmar, Commented May 2, 2014 at 20:32
And I answered below. But how is the difference relevant to fixing the problem? — Barmar
– Barmar, Commented May 2, 2014 at 20:36

Barmar · Accepted Answer · 2014-05-02 20:31:22Z

3

socket_recv allows you to supply extra flags. socket_read() is equivalent to calling socket_recv() with flags = 0. socket_read() also allows you to specify PHP_NORMAL_READ, which only reads up to the next newline (so it's then equivalent to fgets()).

They're also called slightly differently. socket_read() returns the data; socket_recv() takes a variable as a reference parameter and updates it, returning the number of bytes read.

answered May 2, 2014 at 20:31

Barmar

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2 Comments

user3334215 Over a year ago

Thanks mate, is there anyway I can get rid of that warning?

Barmar Over a year ago

My guess is that $resSock is not a valid socket. Post your code that opens the network connection.

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