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socket_get_option($r, $i1, $i2) gets the value of socket option $i2 on the protocol level $i1 for socket $r. For more information, refer to socket_set_option ().socket_cmsg_space($i1, $i2) calculates the message buffer size for type $i2 on protocol level $i1.
socket_getpeername($r, &$s [,&$i]) retrieves the address and port of the remote side of the socket $r and stores them in $s and $i respectively. TRUE is returned on success and FALSE on failure.
socket_getsockname($r, &$s [,&$i]) retrieves the address and port of the local side of the socket $r and stores them in $s and $i respectively. TRUE is returned on success and FALSE on failure.
socket_last_error([$r]) returns the last error on the socket $r as an integer. socket_strerror($i) returns a string describing an error integer.
socket_clear_error([$r]) clears the error on the socket $r or the last error code.