fopen() $mode is ignored for several php:// stream wrappers

Cf. <https://bugs.php.net/79905>.

Author: cmb69

reference/filesystem/functions/fopen.xml

@@ -243,6 +243,14 @@ $handle = fopen("c:\\folder\\resource.txt", "r");
         <literal>'b'</literal> mode instead.
        </para>
       </note>
+      <note>
+       <simpara>
+        The <parameter>mode</parameter> is ignored for <filename>php://output</filename>,
+        <filename>php://input</filename>, <filename>php://stdin</filename>,
+        <filename>php://stdout</filename>, <filename>php://stderr</filename> and
+        <filename>php://fd</filename> stream wrappers.
+       </simpara>
+      </note>
      </listitem>
     </varlistentry>
     <varlistentry>