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<?php
// where status='Open' and category='1' and subCategory='1' and (category like '%test%' or subCategory like '%test%' or title like '%test%' or introduction like '%test%') 
//@link http://stackoverflow.com/a/31558035/5840474 get and or
//@link http://stackoverflow.com/a/28593956/5840474 get like
$where = array(
	array(
	 	'and', 
 		"status='Open'"
	)
);
if(!empty($category)){
	$where[0][] = "category='$category'";
}
if(!empty($subCategory)){
	$where[0][] = "subCategory='$subCategory'";	
}
if(!empty($word)){
	$where[] = array(
		'or',
		array('like','category',$word),
		array('like','subCategory',$word),
		array('like','title',$word),
		array('like','introduction',$word),
	);
}