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                # PHP MySQL Where 子句 WHERE 子句用于過濾記錄。 ## WHERE 子句 WHERE 子句用于提取滿足指定標準的的記錄。 ### 語法 ``` SELECT column_name(s) FROM table_name WHERE column_name operator value ``` 如需學習更多關于 SQL 的知識,請訪問我們的 [SQL 教程](#)。 為了讓 PHP 執行上面的語句,我們必須使用 mysqli_query() 函數。該函數用于向 MySQL 連接發送查詢或命令。 ### 實例 下面的實例將從 "Persons" 表中選取所有 FirstName='Peter' 的行: ``` <?php $con=mysqli_connect("example.com","peter","abc123","my_db"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM Persons WHERE FirstName='Peter'"); while($row = mysqli_fetch_array($result)) { echo $row['FirstName'] . " " . $row['LastName']; echo "<br>"; } ?> ``` 以上代碼將輸出: ``` Peter Griffin ```
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