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This function returns a socket error code.
If a socket resource is passed to this function, the
last error which occured on this particular socket is
returned. If the socket resource is ommited, the error code
of the last failed socket function is returned. The latter is
in particular helpful for functions like
socket_create() which don't return a socket on
failure and socket_select() which can fail for reasons
not directly tied to a particular socket. The error code is
suitable to be fed to
socket_strerror() which returns a string describing
the given error code.
if (false == ($socket = @socket_create(AF_INET, SOCK_STREAM, SOL_TCP))) { die("Couldn't create socket, error code is: " . socket_last_error() . ",error message is: " . socket_strerror(socket_last_error())); } |
注: socket_last_error() does not clear the error code, use socket_clear_error() for this purpose.