As you can see on http://codex.wordpress.org/Function_Reference/get_pages
you can query by meta_key , so to query by product
custom field, you will do something like this .
$args=array(
'meta_key' => 'product'
);
$pages = get_pages( $args );
As you can see on http://codex.wordpress.org/Function_Reference/get_pages
you can query by meta_key , so to query by product
custom field, you will do something like this .
$args=array(
'meta_key' => 'product'
);
$pages = get_pages( $args );