1 | <?php |
||
11 | trait OperationsTrait |
||
12 | { |
||
13 | |||
14 | /** |
||
15 | * Returns the number of parameters. |
||
16 | * |
||
17 | * @return int The number of parameters |
||
18 | */ |
||
19 | 3 | public function count() |
|
23 | |||
24 | /** |
||
25 | * Returns number of items in $collection. |
||
26 | * |
||
27 | * @return int |
||
28 | */ |
||
29 | public function size() |
||
38 | |||
39 | /** |
||
40 | * @return bool |
||
41 | */ |
||
42 | public function isEmpty() |
||
46 | |||
47 | /** |
||
48 | * @return bool |
||
49 | */ |
||
50 | public function isNotEmpty() |
||
54 | |||
55 | /** |
||
56 | * @return $this |
||
57 | */ |
||
58 | 1 | public function clear() |
|
65 | |||
66 | /** |
||
67 | * @return void |
||
68 | */ |
||
69 | abstract public function rewind(); |
||
70 | } |
||
71 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: