Description:
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Please have a look at the code below. I also tried to use a Variant, which doesn't worked out for me. Also "$mycom->myFunction( &$FunctionName );" doesn't work.

Tried with PHP version "5.2.0.0 RC6-dev" and "5.1.6.6"

Reproduce code:
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$mycom = new COM('my.own');
settype($FunctionName,"String");
//$FunctionName = 'a'; // **doesn't work either
$mycom->myFunction( $FunctionName ); /* VT_PTR [26] [out] --> VT_BSTR [8]  */
var_dump($FunctionName); // '' or 'a'**

Expected result:
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'something'

Actual result:
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'' or 'a' (when using "$FunctionName = 'a';")