mysqli_stmt_close()函数结束预处理语句。
mysqli_stmt_close()函数接受一个预处理的语句对象（先前已打开）作为参数，然后将其关闭。
您不能使用此函数关闭持久连接。
mysqli_stmt_close($stmt);
| 序号 | 参数及说明 |
|---|---|
| 1 | stmt(必需) 这是表示准备好的语句的对象。 |
PHP mysqli_stmt_close()函数返回一个布尔值，成功时为true，失败时为false。
此函数最初是在PHP版本5中引入的，并且可以在所有更高版本中使用。
假设我们已经在MySQL数据库中创建了一个名为employee的表，其内容如下：
mysql> select * from employee; +------------+--------------+------+------+--------+ | FIRST_NAME | LAST_NAME | AGE | SEX | INCOME | +------------+--------------+------+------+--------+ | Vinay | Bhattacharya | 20 | M | 16000 | | Sharukh | Sheik | 25 | M | 18300 | | Trupthi | Mishra | 24 | F | 36000 | | Sheldon | Cooper | 25 | M | 12256 | | Sarmista | Sharma | 28 | F | 15000 | +------------+--------------+------+------+--------+ 5 rows in set (0.00 sec)
以下示例演示了mysqli_stmt_close()函数的用法（面向过程风格）-
<?php
$con = mysqli_connect("localhost", "root", "password", "mydb");
$stmt = mysqli_prepare($con, "UPDATE employee set INCOME=INCOME-? where INCOME>?");
mysqli_stmt_bind_param($stmt, "si", $reduct, $limit);
$limit = 16000;
$reduct = 5000;
//执行语句
mysqli_stmt_execute($stmt);
print("Records Updated......\n");
//结束语句
mysqli_stmt_close($stmt);
//关闭连接
mysqli_close($con);
?>输出结果
Records Updated......
执行完上述程序后，employee表的内容如下：
mysql> select * from employee; +------------+--------------+------+------+--------+ | FIRST_NAME | LAST_NAME | AGE | SEX | INCOME | +------------+--------------+------+------+--------+ | Vinay | Bhattacharya | 20 | M | 16000 | | Sharukh | Sheik | 25 | M | 13300 | | Trupthi | Mishra | 24 | F | 31000 | | Sheldon | Cooper | 25 | M | 12256 | | Sarmista | Sharma | 28 | F | 15000 | +------------+--------------+------+------+--------+ 5 rows in set (0.00 sec)
在面向对象风格中，此函数的语法为$stmt-> close();。以下是面向对象风格中此函数的示例；
<?php
//建立连接
$con = new mysqli("localhost", "root", "password", "mydb");
//创建一个表
$con -> query("CREATE TABLE myplayers(ID INT, First_Name VARCHAR(255), Last_Name VARCHAR(255), Place_Of_Birth VARCHAR(255), Country VARCHAR(255))");
print("创建表.....\n");
//Inserting values into the table using prepared statement
$stmt = $con -> prepare( "INSERT INTO myplayers values(?, ?, ?, ?, ?)");
$stmt -> bind_param("issss", $id, $fname, $lname, $pob, $country);
$id = 1;
$fname = 'Shikhar';
$lname = 'Dhawan';
$pob = 'Delhi';
$country = 'India';
//执行语句
$stmt->execute();
//结束语句
$stmt->close();
//关闭连接
$con->close();
?>输出结果
创建表.....
您也可以关闭由mysqli_stmt_prepare()函数创建的语句 -
<?php
$con = mysqli_connect("localhost", "root", "password", "mydb");
$query = "CREATE TABLE Test(Name VARCHAR(255), AGE INT)";
mysqli_query($con, $query);
print("创建表.....\n");
//初始化语句
$stmt = mysqli_stmt_init($con);
mysqli_stmt_prepare($stmt, "INSERT INTO Test values(?, ?)");
mysqli_stmt_bind_param($stmt, "si", $Name, $Age);
$Name = 'Raju';
$Age = 25;
print("插入记录.....");
//执行语句
mysqli_stmt_execute($stmt);
//结束语句
mysqli_stmt_close($stmt);
//关闭连接
mysqli_close($con);
?>输出结果
创建表..... 插入记录.....