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                # PHP array_map() 函數 ## 定義和用法 array_map() 函數返回用戶自定義函數作用后的數組。回調函數接受的參數數目應該和傳遞給 array_map() 函數的數組數目一致。 ### 語法 ``` array_map(function,array1,array2,array3...) ``` | 參數 | 描述 | | --- | --- | | function | 必需。用戶自定義函數的名稱,或者是 null。 | | array1 | 必需。規定數組。 | | array2 | 可選。規定數組。 | | array3 | 可選。規定數組。 | ## 例子 1 ``` <?php function myfunction($v) { if ($v==="Dog") { return "Fido"; } return $v; } $a=array("Horse","Dog","Cat"); print_r(array_map("myfunction",$a)); ?> ``` 輸出: ``` Array ( [0] => Horse [1] => Fido [2] => Cat ) ``` ## 例子 2 使用多個參數: ``` <?php function myfunction($v1,$v2) { if ($v1===$v2) { return "same"; } return "different"; } $a1=array("Horse","Dog","Cat"); $a2=array("Cow","Dog","Rat"); print_r(array_map("myfunction",$a1,$a2)); ?> ``` 輸出: ``` Array ( [0] => different [1] => same [2] => different ) ``` ## 例子 3 請看當自定義函數名設置為 null 時的情況: ``` <?php $a1=array("Dog","Cat"); $a2=array("Puppy","Kitten"); print_r(array_map(null,$a1,$a2)); ?> ``` 輸出: ``` Array ( [0] => Array ( [0] => Dog [1] => Puppy ) [1] => Array ( [0] => Cat [1] => Kitten ) ) ```
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