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                ## where where函數會遍歷當前數據源,并為每一項元素都應用傳入的過濾函數,最后返回滿足條件的元素的集合。 例子: ~~~ //創建數據源 $dataSource = Traversable::from(['foo', 'bar', 'baz', 'tear', 'cow', 'tripod', 'whisky', 'sand', 'which']); //根據where函數傳入的Lambda表達式,來篩選數據源 $result=$dataSource->where(function($e){ return strlen($e)>=4; //字符長度大于等于4的元素 }); foreach ($result as $s){ dump($s); } ~~~ 打印的結果: ~~~ "tear" "tripod" "whisky" "sand" "which" ~~~ 例子: ~~~ $dataSource = Traversable::from([1,4,8,5,10,43,53,12,0]); $result=$dataSource->where(function($e){ return $e>=10; }); foreach ($result as $s){ dump($s); } ~~~ 打印結果: ~~~ 10 43 53 12 ~~~
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