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                # PHP mysqli_affected_rows() 函數 ## 實例 從不同的查詢中輸出所影響記錄行數: ``` <?php $con=mysqli_connect("localhost","my_user","my_password","my_db"); if (mysqli_connect_errno($con)) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); } // Perform queries and print out affected rows mysqli_query($con,"SELECT * FROM Persons"); echo "Affected rows: " . mysqli_affected_rows($con); mysqli_query($con,"DELETE FROM Persons WHERE Age>32"); echo "Affected rows: " . mysqli_affected_rows($con); mysqli_close($con); ?> ``` ## 定義和用法 mysqli_affected_rows() 函數返回前一次 MySQL 操作(SELECT、INSERT、UPDATE、REPLACE、DELETE)所影響的記錄行數。 ## 語法 mysqli_affected_rows(_connection_)_;_ | 參數 | 描述 | | --- | --- | | _connection_ | 必需。規定要使用的 MySQL 連接。 | ## 技術細節 | 返回值: | 一個 &gt; 0 的整數表示所影響的記錄行數。0 表示沒有受影響的記錄。-1 表示查詢返回錯誤。 | | :-- | --- | | PHP 版本: | 5+ | | :-- | --- |
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