mysqli.dll是PHP對mysql新特性的一個擴展支持。在PHP5中可以在php.ini中加載,如下圖: interface, ingenious, incompatible or incomplete(改擴展仍在開發中,因為MYSQL4。1和MYSQL5都沒有正式推出尚在開發中,新的特性沒有完全實現) mysqli想實現的目標具體有: -更簡單的維護 -更好的兼容性 -向後兼容 mysql(指PHP中的模塊)發展到現在顯得比較凌亂,有必要重新做下整理。同時,有必要跟上MYSQL(DBMS)的發展步伐,加入新的特性的支持,以及適應MYSQL(DBMS)以後的版本。所以誕生了mysqli.dll mysqli.dll的特性: -可以和mysql.dll一樣的方式使用 -支持OO接口,簡簡單單調用 -支持MYSQL4。1引入的新特性 -通過mysqli_init() 等相關函數,可以設置高級連接選項 mysqli的使用例子: 1.和以前mysql.dll一樣的方法: <?php /* Connect to a MySQL server */ $link = mysqli_connect( 'localhost', /* The host to connect to */ 'user', /* The user to connect as */ 'passWord', /* The password to use */ 'world'); /* The default table to query */ if (!$link) { printf("Can't connect to MySQL Server. Errorcode: %sn", mysqli_connect_error()); exit; } /* Send a query to the server */ if ($result = mysqli_query($link, 'SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5')) { print("Very large cities are:n"); /* Fetch the results of the query */ while( $row = mysqli_fetch_assoc($result) ){ printf("%s (%s)n", $row['Name'], $row['Population']); } /* Destroy the result set and free the memory used for it */ mysqli_free_result($result); } /* Close the connection */ mysqli_close($link); ?> 輸出結果: Very large cities are: Mumbai (Bombay) (10500000) Seoul (9981619) São Paulo (9968485) Shanghai (9696300) Jakarta (9604900) 2.使用內置OO接口方式調用: <?php /* Connect to a MySQL server */ $mysqli = new mysqli('localhost', 'user', 'password', 'world'); if (mysqli_connect_errno()) { printf("Can't connect to MySQL Server. Errorcode: %sn", mysqli_connect_error()); exit; } /* Send a query to the server */ if ($result = $mysqli->query('SELECT Name, Population FROM City ORDER BY Population DESC LIMIT 5')) { print("Very large cities are:n"); /* Fetch the results of the query */ while( $row = $result->fetch_assoc() ){ printf("%s (%s)n", $row['Name'], $row['Population']); } /* Destroy the result set and free the memory used for it */ $result->close(); } /* Close the connection */ $mysqli->close(); ?> 支持的新特性還有:Bound Parameters,Bound Results等。。。