Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
| 1 | <?php  | 
            ||
| 18 | class Query  | 
            ||
| 19 | { | 
            ||
| 20 | /**  | 
            ||
| 21 | * @var Select|SelectOrUnionAll|UnionAll  | 
            ||
| 22 | */  | 
            ||
| 23 | protected $selectOrUnionAll;  | 
            ||
| 24 | |||
| 25 | /**  | 
            ||
| 26 | * @var Order[]  | 
            ||
| 27 | */  | 
            ||
| 28 | protected $orders;  | 
            ||
| 29 | |||
| 30 | /**  | 
            ||
| 31 | * @var Cursor  | 
            ||
| 32 | */  | 
            ||
| 33 | protected $cursor;  | 
            ||
| 34 | |||
| 35 | /**  | 
            ||
| 36 | * @var int  | 
            ||
| 37 | */  | 
            ||
| 38 | protected $limit;  | 
            ||
| 39 | |||
| 40 | /**  | 
            ||
| 41 | * @var Direction  | 
            ||
| 42 | */  | 
            ||
| 43 | protected $direction;  | 
            ||
| 44 | |||
| 45 | /**  | 
            ||
| 46 | * @var bool  | 
            ||
| 47 | */  | 
            ||
| 48 | protected $exclusive;  | 
            ||
| 49 | |||
| 50 | /**  | 
            ||
| 51 | * @var bool  | 
            ||
| 52 | */  | 
            ||
| 53 | protected $seekable;  | 
            ||
| 54 | |||
| 55 | /**  | 
            ||
| 56 | * @var mixed  | 
            ||
| 57 | */  | 
            ||
| 58 | protected $builder;  | 
            ||
| 59 | |||
| 60 | /**  | 
            ||
| 61 | * @param string[][] $orders  | 
            ||
| 62 | * @param Cursor|int[]|string[] $cursor  | 
            ||
| 63 | * @param int $limit  | 
            ||
| 64 | * @param bool $backward  | 
            ||
| 65 | * @param bool $exclusive  | 
            ||
| 66 | * @param bool $seekable  | 
            ||
| 67 | * @param mixed $builder  | 
            ||
| 68 | * @return static  | 
            ||
| 69 | */  | 
            ||
| 70 | 17 | public static function create(array $orders, $cursor, $limit, $backward, $exclusive, $seekable, $builder = null)  | 
            |
| 86 | |||
| 87 | /**  | 
            ||
| 88 | * Query constructor.  | 
            ||
| 89 | *  | 
            ||
| 90 | * @param Select|SelectOrUnionAll|UnionAll $selectOrUnionAll  | 
            ||
| 91 | * @param Order[] $orders  | 
            ||
| 92 | * @param Cursor $cursor  | 
            ||
| 93 | * @param Limit $limit  | 
            ||
| 94 | * @param Direction $direction  | 
            ||
| 95 | * @param bool $exclusive  | 
            ||
| 96 | * @param bool $seekable  | 
            ||
| 97 | * @param mixed $builder  | 
            ||
| 98 | */  | 
            ||
| 99 | 17 | public function __construct(SelectOrUnionAll $selectOrUnionAll, array $orders, Cursor $cursor, Limit $limit, Direction $direction, $exclusive, $seekable, $builder = null)  | 
            |
| 120 | |||
| 121 | /**  | 
            ||
| 122 | * @return Select|SelectOrUnionAll|UnionAll  | 
            ||
| 123 | */  | 
            ||
| 124 | 17 | public function selectOrUnionAll()  | 
            |
| 128 | |||
| 129 | /**  | 
            ||
| 130 | * @return Order[]  | 
            ||
| 131 | */  | 
            ||
| 132 | public function orders()  | 
            ||
| 136 | |||
| 137 | /**  | 
            ||
| 138 | * @return Cursor  | 
            ||
| 139 | */  | 
            ||
| 140 | public function cursor()  | 
            ||
| 144 | |||
| 145 | /**  | 
            ||
| 146 | * @return int  | 
            ||
| 147 | */  | 
            ||
| 148 | 2 | public function limit()  | 
            |
| 152 | |||
| 153 | /**  | 
            ||
| 154 | * @return Direction  | 
            ||
| 155 | */  | 
            ||
| 156 | 2 | public function direction()  | 
            |
| 160 | |||
| 161 | /**  | 
            ||
| 162 | * @return bool  | 
            ||
| 163 | */  | 
            ||
| 164 | public function forward()  | 
            ||
| 168 | |||
| 169 | /**  | 
            ||
| 170 | * @return bool  | 
            ||
| 171 | */  | 
            ||
| 172 | public function backward()  | 
            ||
| 176 | |||
| 177 | /**  | 
            ||
| 178 | * @return bool  | 
            ||
| 179 | */  | 
            ||
| 180 | public function exclusive()  | 
            ||
| 184 | |||
| 185 | /**  | 
            ||
| 186 | * @return bool  | 
            ||
| 187 | */  | 
            ||
| 188 | public function inclusive()  | 
            ||
| 192 | |||
| 193 | /**  | 
            ||
| 194 | * @return bool  | 
            ||
| 195 | */  | 
            ||
| 196 | public function seekable()  | 
            ||
| 200 | |||
| 201 | /**  | 
            ||
| 202 | * @return bool  | 
            ||
| 203 | */  | 
            ||
| 204 | public function unseekable()  | 
            ||
| 208 | |||
| 209 | /**  | 
            ||
| 210 | * @return mixed  | 
            ||
| 211 | */  | 
            ||
| 212 | 2 | public function builder()  | 
            |
| 216 | |||
| 217 | /**  | 
            ||
| 218 | * Clone Query.  | 
            ||
| 219 | */  | 
            ||
| 220 | View Code Duplication | public function __clone()  | 
            |
| 228 | }  | 
            ||
| 229 | 
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)or! empty(...)instead.