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Question

我希望$teacherIDList在使用相同的courseID循环时包含teacherID，例如我希望它为('RITC01','RITC01')但目前只有('RITC01')。

PHP：

function getTeacherID($subjectID) {
    require ('dbconnect.php');
    $teacherIDSQL = mysqli_query($dbc,"SELECT teacherID FROM TeacherClassRoomCourse WHERE courseID = '$subjectID'");
    $teacherIDList = [];
    while($teacherID = mysqli_fetch_array($teacherIDSQL,MYSQLI_ASSOC)) {
        array_push($teacherIDList, $teacherID['teacherID']);
        return $teacherIDList;
    }  
}
getTeacherID('COMP12');

dbconnect.php包含连接到数据库的$dbc。

TeacherClassRoomCourse表：

TeacherClassRoomCourse sql table

Answer 1

您需要做的就是像在此

那样移动您在while循环之外构建的数组的返回

function getTeacherID($subjectID) {
    require ('dbconnect.php');
    $teacherIDSQL = mysqli_query($dbc,"SELECT teacherID FROM TeacherClassRoomCourse WHERE courseID = '$subjectID'");
    $teacherIDList = [];
    while($teacherID = mysqli_fetch_array($teacherIDSQL,MYSQLI_ASSOC)) {
        array_push($teacherIDList, $teacherID['teacherID']);

    }  
    return $teacherIDList;
}
$someting = getTeacherID('COMP12');

Answer 2

你return循环中的while，所以它在第一次迭代后就会中断。将return移到循环外部，以便它可以遍历所有结果，而不仅仅是第一个结果。

function getTeacherID($subjectID) {
    require ('dbconnect.php');
    $teacherIDSQL = mysqli_query($dbc,"SELECT teacherID FROM TeacherClassRoomCourse WHERE courseID = '$subjectID'");
    $teacherIDList = [];
    while($teacherID = mysqli_fetch_array($teacherIDSQL,MYSQLI_ASSOC)) {
        array_push($teacherIDList, $teacherID['teacherID']);
    }  
    return $teacherIDList; // Return after while is complete
}

注意：

您还容易受到SQL注入攻击，应该使用带占位符的参数化查询。
您在代码中没有使用getTeacherID()做任何事情，您需要将其分配给变量$results = getTeacherID('COMP12');

mysqli包含数组重复值

2 个答案:

参考