Best way of iterating over object member fields?

I came across a bug in some of my code, where I do something like the following: $obj = new MyObject(); foreach ($obj as $key=>$value) {

    echo $key;

} Note that I don't use $value in the loop - I'm only doing processing based on the field name. Now my IDE flags this unused variable as a hint, so (on autopilot) I changed it to be $obj = new MyObject(); foreach (array_keys($obj) as $key) { echo $key; } Which removes the hint, and looks like the right sort of thing. Of course this doesn't work: "array_keys() expects parameter 1 to be an array, object found". So what is the correct way to list the field names of an object? Cheers Pete -- Peter Ford phone: 01580 893333 fax: 01580 893399 Justcroft International Ltd. www.justcroft.com Justcroft House, High Street, Staplehurst, Kent TN12 0AH United Kingdom Registered in England and Wales: 2297906 Registered office: Stag Gates House, 63/64 The Avenue, Southampton SO17 1XS