幫我看看，這段資料庫連結程式碼有沒有什麼問題？

新自學php，書上一直沒有好的例子，網上的也有錯誤，自己照著php手冊寫了一個完整點的
高手幫我看一下，有沒有哪裡寫錯了...謝謝了

<code>//面向对象
$mysqli = new mysqli("localhost", "user", "pass", "database");  
if(mysqli_connect_errno())) {  //这边判断方式和下面面向过程中的直接判断变量有什么区别？
    printf("Connect failed: %s\n",  mysqli_connect_error());
    exit();
}
$query =  "SELECT `name`, `address`, `phone` FROM Users WHERE gender=? AND age=?";
if($stmt = $mysqli->prepare($query) {
    $stmt->bind_param("si", $gender, $age);  //这边插入参数是不是写在这里？
    $stmt->execute();
    $stmt->bind_result($name, $address, $phone);
     
    while($stmt->fetch()) {
         printf ("%s (%s,%s)<br />", $name, $address, $phone); 
    }
    $stmt->close();
}
$mysqli->close();
 
/面向过程
$mysqli = mysqli_connecti("localhost", "user", "pass", "database");
if(!$mysqli) {
    printf ("Connect failed: %s\n",  mysqli_connect_error());
    exit();
}
$query =  "SELECT `name`, `address`, `phone` FROM Users WHERE gender=? AND age=?";
if ($stmt = mysqli_prepare($query)){
    mysqli_stmt_bind_param($stmt, "si", $gender, $age);
    mysqli_stmt_execute($stmt);
    mysqli_stmt_bind_result($stmt, $name, $address, $phone);
     
    while (mysqli_stmt_fetch($stmt)) {
        printf ("%s (%s,%s)<br />", $name, $address, $phone); 
    }
    mysqli_stmt_close($stmt);
}
$mysqli_close();</code>

回覆內容：

新自學php，書上一直沒有好的例子，網上的也有錯誤，自己照著php手冊寫了一個完整點的
高手幫我看一下，有沒有哪裡寫錯了...謝謝了

<code>//面向对象
$mysqli = new mysqli("localhost", "user", "pass", "database");  
if(mysqli_connect_errno())) {  //这边判断方式和下面面向过程中的直接判断变量有什么区别？
    printf("Connect failed: %s\n",  mysqli_connect_error());
    exit();
}
$query =  "SELECT `name`, `address`, `phone` FROM Users WHERE gender=? AND age=?";
if($stmt = $mysqli->prepare($query) {
    $stmt->bind_param("si", $gender, $age);  //这边插入参数是不是写在这里？
    $stmt->execute();
    $stmt->bind_result($name, $address, $phone);
     
    while($stmt->fetch()) {
         printf ("%s (%s,%s)<br />", $name, $address, $phone); 
    }
    $stmt->close();
}
$mysqli->close();
 
/面向过程
$mysqli = mysqli_connecti("localhost", "user", "pass", "database");
if(!$mysqli) {
    printf ("Connect failed: %s\n",  mysqli_connect_error());
    exit();
}
$query =  "SELECT `name`, `address`, `phone` FROM Users WHERE gender=? AND age=?";
if ($stmt = mysqli_prepare($query)){
    mysqli_stmt_bind_param($stmt, "si", $gender, $age);
    mysqli_stmt_execute($stmt);
    mysqli_stmt_bind_result($stmt, $name, $address, $phone);
     
    while (mysqli_stmt_fetch($stmt)) {
        printf ("%s (%s,%s)<br />", $name, $address, $phone); 
    }
    mysqli_stmt_close($stmt);
}
$mysqli_close();</code>

程式碼是寫出來跑的，程式碼寫的對不對，得問編譯器或解析器，它們才是真正的老師。

你自己跑一遍呀。 。 。

這肉眼真不好看,最後一句好像有問題, 得傳入參數($mysqli)吧.

prepare+execute後bind_result+循環fetch是傳統的做法.
PHP從5.4開始底層預設採用mysqlnd實作mysql,mysqli,pdo_mysql.
這時你可以使用get_result 和fetch_all 快速拿到查詢結果. $stmt->get_result()->fetch_all(MYSQLI_ASSOC)
即可拿到結果集.例如:

<code>post.php?id=1024

MySQLi普通查询:
$db = new mysqli('127.0.0.1','user','pass','dbname',3306);
var_export($db->query('SELECT * FROM posts WHERE id='.intval($_GET['id']))->fetch_all());

MySQLi预处理绑定参数查询:
$db = new mysqli('127.0.0.1','user','pass','dbname',3306);
$stmt = $db->prepare('SELECT * FROM posts WHERE id=?'); //预处理
$stmt->bind_param('i', $_GET['id']); //绑定参数(可以防止SQL注入)
$stmt->execute(); //查询
var_export($stmt->get_result()->fetch_all());</code>