使用 mysqli 和 PHP 正确访问整行以进行数据库插入

Question

我正在开展一个项目，我们使用数据库向用户发送消息。在这个 php 文件中，我使用 to、from、date 和 message 字段插入到数据库中。目标是向某个公司内的所有人发送相同的信息。但是，当我尝试发送它时，消息有时不会发送，当它发送时，它只会向我从数据库中获取的组/行中的第一个联系人发送消息。我在网上看到过其他例子，但到目前为止，我还没有看到其他人有这个确切的问题。任何建议将不胜感激。

$sql = 'SELECT drivers.username FROM project.drivers WHERE drivers.sponsor="'.$_SESSION["company"].'"'; //query to get all driver usernames within one company
$result = $conn->query($sql);
//$row = mysqli_fetch_array($result);
while($row = mysqli_fetch_array($result)){ //iterating throughout all the drivers
    $to  = $row["username"]; //username of current driver
    $from = $_SESSION["username"]; //from current company
    $message = $_SESSION["username"] . " updated your point to dollar ratio. Your new point to dollar ratio is " . $_SESSION["pointRatio"] . "."; //message
    $sql2 = "INSERT INTO project.messages(messages.date, messages.to, messages.from, messages.message) VALUES(now(), '".$to."', '".$from."', '".$message."')"; //inserting message into database
    $conn->query($sql2); //query for database
    $to  = $_SESSION["username"]; //this is the same format but sending the message to the company itself
    $message = $_SESSION["username"] . " updated your point to dollar ratio. Your new point to dollar ratio is " . $_SESSION["pointRatio"] . ".";
    $sql2 = "INSERT INTO project.messages(messages.date, messages.to, messages.from, messages.message) VALUES(now(), '".$to."', '".$from."', '".$message."')";
    $conn->query($sql2);
}

Answer 1

如果您添加 var_dump 并检查数据库中的记录 - 是否正确？你真的得到了所有的行吗？

$sql = 'SELECT drivers.username FROM project.drivers WHERE drivers.sponsor="'.$_SESSION["company"].'"'; //query to get all driver usernames within one company
$result = $conn->query($sql);
//$row = mysqli_fetch_array($result);
while($row = mysqli_fetch_array($result)){ //iterating throughout all the drivers
    var_dump($row);
}