PHP/MYSQL循环只迭代一次，无法在数组中存储数据_Php_Mysql_Sql_Arrays

PHP/MYSQL循环只迭代一次，无法在数组中存储数据

php mysql sql arrays

PHP/MYSQL循环只迭代一次，无法在数组中存储数据,php,mysql,sql,arrays,Php,Mysql,Sql,Arrays,我有下面的一段代码，它连接两个表，然后返回users表中所有作为教师的用户对于有资格成为教师的用户，将从教师表中检索信息因此，假设有3个用户符合users表中的教师资格，那么所有3个具有这些信息的用户都应该存储在一个数组中当页面加载时，数组变空 SQL语句 //IF my reasoning is correct the folllowing sql query should select alll users who qualifies as teachers $sql = "SELEC

我有下面的一段代码，它连接两个表，然后返回

users

表中所有作为教师的用户

对于有资格成为教师的用户，将从

教师

表中检索信息

因此，假设有3个用户符合

users

表中的教师资格，那么所有3个具有这些信息的用户都应该存储在一个数组中

当页面加载时，数组变空

SQL语句

//IF my reasoning is correct the folllowing sql query should select alll users who qualifies as teachers
$sql = "SELECT users.*, teachers.*
        FROM users INNER JOIN teachers ON teachers.userID = users.userID";

功能

public function showAllTeachers()
    {
        $db = DB::getInstance();
        $sql = "SELECT users.*, teachers.*
        FROM users INNER JOIN teachers ON teachers.userID = users.userID";

        //simple DB QUERY
        $stmnt = $db->prepare($sql);
        $stmnt->execute();
        $teachers = $stmnt->fetchAll();
        $teacherInfo = array();

        //Check if there are any users who qualifies as teachers else return fals
        if ($stmnt->rowCount() > 0) {
            foreach($teachers as $teacher){
          //Store all teacher info in array $teacherInfo
          //There are more than 1 teacher so loop shouldl iterate more than once

                $teacherInfo = array('name' =>$teacher['firstname'], 'headline' =>$teacher['headline'], 'location' => $teacher['location'],
                    'age' => $teacher['age'], 'experience' => $teacher['experience'], 'imgPath' => $teacher['imgPath']);
            }//foreach

            //return array with teacher info
            return $teacherInfo;
        }//rowcount
        else {
            return false; //no teachers
                }
    }//function

由于有1个以上的用户符合教师资格，

$teacherInfo

现在应该包含所有这些教师的数据

清空数组

加载页面时将运行以下命令，并应显示所有教师

我的问题 清空数组

$allTeachers

时，我只返回一个结果（teacher）。因此，出于某种原因，我的循环只迭代一次

 $teachers = new TeacherSearch();
           $allTeachers = $teachers->showAllTeachers();
            if(is_array($allTeachers)){
                foreach($allTeachers as $key => $teacher){
                    echo $key;
                    echo $teacher;
                    echo '<br />';
                }
              }

$teachers=新教师搜索（）；
$allTeachers=$teachers->showAllTeachers（）；
if（is_数组（$allTeachers））{
foreach（$key=>$teacher的所有教师）{
echo$key；
老师；
回声“
”；
}
}

非常感谢您的帮助

其他信息

数据库

教师表

用户表

用户表数据

循环只执行一次似乎不是问题，在循环中添加

echo'test'

，您将看到它被执行多次（当然，只要

$teachers

有多个元素）

问题是您在每个

foreach

循环执行上覆盖了

$teacherInfo

，而不是向其追加新数组

替换：

$teacherInfo = array('name' =>$teacher['firstname'], 'headline' =>$teacher['headline'], 'location' => $teacher['location'],
    'age' => $teacher['age'], 'experience' => $teacher['experience'], 'imgPath' => $teacher['imgPath']);

与：

$teacherInfo[] = array('name' =>$teacher['firstname'], 'headline' =>$teacher['headline'], 'location' => $teacher['location'],
    'age' => $teacher['age'], 'experience' => $teacher['experience'], 'imgPath' => $teacher['imgPath']);