php中prepared语句的执行顺序

我已经阅读了所有关于准备好的语句的内容，但我仍然不确定执行的顺序。。。（许多使用不同的顺序）

这道菜好吗

$sql = 'SELECT * FROM ... WHERE ... = ?';

$conn = ...connection to database...
$stmt = $conn->stmt_init();
$stmt->prepare($sql);
$stmt->bind_param('i', $param);
$stmt->execute();
$stmt->store_result(); // results are cached and accessed from memeory, therefore faster but use more memory
$num_rows = $stmt->num_rows; // how many? (can only be use with store_result() )
$stmt->bind_result($column, ...);
$stmt->fetch(); // use in loop if necessary
$stmt->free_result(); // use only with store_result()
$stmt->close(); // close prepared statement
$conn->close(); // close database

显然不是

虽然顺序很好，但您使用的许多运算符都是多余和无用的。此外，在执行单个查询的上下文中不应该有连接相关的代码

include 'db.php'; // here goes connect
$sql = 'SELECT * FROM ... WHERE ... = ?';
$stmt->prepare($sql);
$stmt->bind_param('i', $param);
$stmt->execute();
$stmt->bind_result($column, ...);
$stmt->fetch();

够了。请注意，如果有数据，则不需要行计数