Warning: stream_select(): unable to select [0]: No error in ...

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while (true) {
    $read = array(STDIN);
    $write = $except = NULL;
    if (stream_select($read, $write, $except, 0)) {

When I run this in PHP4, I get a "warning: stream select(): unable to
select [0]: No error" error.  In PHP5, I don't.  Any ideas as to why?

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