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                # PHP compact() 函數 ## 定義和用法 compact() 函數創建一個由參數所帶變量組成的數組。如果參數中存在數組,該數組中變量的值也會被獲取。 本函數返回的數組是一個關聯數組,鍵名為函數的參數,鍵值為參數中變量的值。 本函數執行的行為與 [extract()](/php/func_array_extract.asp "PHP extract() 函數") 正好相反。 ### 語法 ``` compact(var1,var2...) ``` | 參數 | 描述 | | --- | --- | | var1 | 必需。可以是帶有變量名的字符串,或者是一個變量數組。 | | var2 | 可選。可以是帶有變量名的字符串,或者是一個變量數組。允許多個參數。 | ## 注釋和提示 注釋:任何沒有變量名與之對應的字符串都被略過。 ## 例子 1 ``` <?php $firstname = "Peter"; $lastname = "Griffin"; $age = "38"; $result = compact("firstname", "lastname", "age"); print_r($result); ?> ``` 輸出: ``` Array ( [firstname] => Peter [lastname] => Griffin [age] => 38 ) ``` ## 例子 2 使用沒有對應變量名的字符串,以及一個變量名數組: ``` <?php $firstname = "Peter"; $lastname = "Griffin"; $age = "38"; $name = array("firstname", "lastname"); $result = compact($name, "location", "age"); print_r($result); ?> ``` 輸出: ``` Array ( [firstname] => Peter [lastname] => Griffin [age] => 38 ) ```
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