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                # PHP array_filter() 函數 ## 定義和用法 array_filter() 函數用回調函數過濾數組中的元素,如果自定義過濾函數返回 true,則被操作的數組的當前值就會被包含在返回的結果數組中, 并將結果組成一個新的數組。如果原數組是一個關聯數組,鍵名保持不變。 ### 語法 ``` array_filter(array,function) ``` | 參數 | 描述 | | --- | --- | | array | 必需。規定輸入的數組。 | | function | 必需。自定義函數的名稱。 | ## 例子 ``` <?php function myfunction($v) { if ($v==="Horse") { return true; } return false; } $a=array(0=>"Dog",1=>"Cat",2=>"Horse"); print_r(array_filter($a,"myfunction")); ?> ``` 輸出: ``` Array ( [2] => Horse ) ```
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