在php中获取bind_参数时出错

我得到一个错误

致命错误：未捕获错误：调用布尔值上的成员函数bind_param（）。我已经尝试了我所知道的一切，但我无法让它发挥作用。这就是我到目前为止所做的：

$db = "THIS IS CORRECT, TRUST ME. I HAVE TESTED IT :)";
$team = mysqli_real_escape_string($db, $_POST['team']);
$sqlcheckteam = $db->prepare("SELECT teamnum FROM teams WHERE teamnum=?");
$sqlcheckteam->bind_param('s', $bindteam);
$bindteam = $team;
$sqlcheckteam->execute();

奇怪的是，它可以在我的本地主机服务器上工作，但不能在我的实际服务器上工作

任何帮助都将不胜感激

如果这有什么关系或帮助的话，我使用的是PHP7.1.2


如果我能得到上传这个的帮助，那就太好了：）

您应该合并一些错误检查，以查看实际问题是什么。试试这个例子

# try statement to catch thrown exceptions (error messages)
try {

    # Make MYSQLI Connection
    $mysqli = new mysqli("host", "user", "password", "database");

    if ( $mysqli->connect_errno ) {

        # Throw connections error message
        throw new Exception("Error, could not connect to database.");

    }

    # Prepare your query for execution
    $stmt = $mysqli->prepare("SELECT `teamnum` FROM `teams` WHERE `teamnum`= ?");

    # Bind the two parameters to your statement
    $stmt->bind_param("i", $_POST['team']);

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not process data submitted.");

    }

    # Excecute your query
    $stmt->execute();

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, count not execute database query.");

    }

    # Bind the results to a variable
    $stmt->bind_result($teamnum);

    # Fetch your data
    while($stmt->fetch()){

        $mynumber = $teamnum;

    }

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not get results from database.");

    }

    #Prepare an INSERT query to insert into database
    $stmt = $mysqli->prepare("INSERT INTO `TABLE_NAME` ( `COLUMN_NAME` ) VALUES ( ? )");

    # Bind the two parameters to your statement
    $stmt->bind_param("i", $mynumber);

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not process to insert.");

    }

    # Excecute your query
    $stmt->execute();

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, count not execute database query.");

    }

    # close your statement
    $stmt->close();

    # Kill Connection
    $thread = $mysqli->thread_id;
    $mysqli->kill($thread);

}

# Catch any exceptions thrown and output the error
catch( Exception $e ) {

    # Check if statement is still open and close it
    if($stmt){
        $stmt->close();
    }

    if($mysqli){
        # Kill Connection
        $thread = $mysqli->thread_id;
        $mysqli->kill($thread);
    }

    # Create your error response
    die($e->getMessage());

}

更改代码顺序，如$bindteam=$team$sqlcheckteam->bind_参数（'s'，$bindteam）；看起来您混合了过程化和面向对象的mysqli。请查看手册中的真实字符串，并尝试将其切换为OO样式@tjfo你介意解释一下你所说的过程化、面向对象和OO风格是什么意思吗？抱歉，我不明白这意味着什么如果你试图使用准备好的语句，你就做错了，因为你不需要像为你处理的那样用准备好的语句逃逸。@ShaneHenry我试图使用准备好的语句，但在我的localhost服务器上，我的get_result（）没有问题，但在我的实际服务器上，我得到了一个错误，我读到应该使用bind_param（）。我现在很困惑，这起作用了，谢谢！还有一个问题：我还有一个问题。现在我需要帮助上传到数据库。（我会在底部的问题中加上）很简单。。。。在关闭之前使用相同的连接。准备一个新查询，绑定数据并执行。我已经更新了我的代码，给大家展示了一个例子。非常感谢！谢谢你，先生：-）让我们来。
# try statement to catch thrown exceptions (error messages)
try {

    # Make MYSQLI Connection
    $mysqli = new mysqli("host", "user", "password", "database");

    if ( $mysqli->connect_errno ) {

        # Throw connections error message
        throw new Exception("Error, could not connect to database.");

    }

    # Prepare your query for execution
    $stmt = $mysqli->prepare("SELECT `teamnum` FROM `teams` WHERE `teamnum`= ?");

    # Bind the two parameters to your statement
    $stmt->bind_param("i", $_POST['team']);

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not process data submitted.");

    }

    # Excecute your query
    $stmt->execute();

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, count not execute database query.");

    }

    # Bind the results to a variable
    $stmt->bind_result($teamnum);

    # Fetch your data
    while($stmt->fetch()){

        $mynumber = $teamnum;

    }

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not get results from database.");

    }

    #Prepare an INSERT query to insert into database
    $stmt = $mysqli->prepare("INSERT INTO `TABLE_NAME` ( `COLUMN_NAME` ) VALUES ( ? )");

    # Bind the two parameters to your statement
    $stmt->bind_param("i", $mynumber);

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, could not process to insert.");

    }

    # Excecute your query
    $stmt->execute();

    if ( $stmt === false ) {

        # Throw Exception (error message)
        throw new Exception("Error, count not execute database query.");

    }

    # close your statement
    $stmt->close();

    # Kill Connection
    $thread = $mysqli->thread_id;
    $mysqli->kill($thread);

}

# Catch any exceptions thrown and output the error
catch( Exception $e ) {

    # Check if statement is still open and close it
    if($stmt){
        $stmt->close();
    }

    if($mysqli){
        # Kill Connection
        $thread = $mysqli->thread_id;
        $mysqli->kill($thread);
    }

    # Create your error response
    die($e->getMessage());

}