Fix #65879: stream_select on STDIN returns 1 even on blocking stream

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@350535 c90b9560-bf6c-de11-be94-00142212c4b1

reference/stream/functions/stream-select.xml

@@ -210,11 +210,16 @@ if (false === stream_select($r, $w, $e, 0)) {
    </para>
   </note>
   <note>
+   <title>Windows compatibility</title>
    <para>
     Use of <function>stream_select</function> on
     file descriptors returned by <function>proc_open</function> will fail
     and return &false; under Windows.
    </para>
+   <para>
+    <constant>STDIN</constant> from a console changes status as soon as <emphasis>any</emphasis>
+    input events are available, but reading from the stream may still block.
+   </para>
   </note>
  </refsect1>