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                變量名命名采用駝峰命名法,除第一個單詞首字母小寫外,其他單詞首字母都大寫,單詞與單詞之間直接連接;變量名應該使用具有明確意義的單詞,較長的單詞可以考慮使用縮寫形式,如:msg(message)、num(number)、val(value)、str(string)、arr(array)、inst(instance)、dir(directory)、idx(index)、app(application)、lang(language)、fp(file pointer)等,但不管怎樣,在同一個人的代碼里,應當保持一致的風格;為了方便閱讀,賦值等號兩邊各一個空格;結構簡單的數組寫在一行,復雜的可分多行寫。 **示例代碼:** ``` <?php $userId = 9527; $itemId = 4001; $msg = 'Hello world!'; // message的縮寫 $num = 5; // number的縮寫 $dataArr = array(1, 2, 3); $rewardArr = array( 4001 => 10, 5001 => 20, 6001 => 30, 7001 => 40, 8001 => 50, ); ```
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