htmlWriter modifications using the PHP class - How?

CKEDITOR.replace( 'editor1',
{
on :
{
instanceReady : function( ev )
{
// Output paragraphs as <p>Text</p>.
this.dataProcessor.writer.setRules( 'p',
{
indent : false,
breakBeforeOpen : true,
breakAfterOpen : false,
breakBeforeClose : false,
breakAfterClose : true
});
}
}
});