我正在开发一个下拉菜单，该菜单使用HTML optgroups作为员工所属的组名。这是MySQL查询和输出：
mysql> SELECT employee.emp_id，employees.empname，employees.grp_id，groups.groupname FROM雇员离开的雇员加入员工组。grp_id= groups.grp_id，按组名asc排序；
+ -------- + ------------ + -------- + ----------- +
| emp_id | empname | grp_id | 组名|
+ -------- + ------------ + -------- + ----------- +
| 20 | 员工2 | 13 | 第1组|
| 19 | 员工1 | 13 | 第1组|
| 21 | 员工3 | 14 | 第2组|
+ -------- + ------------ + -------- + ----------- +
设置3行(0.00秒)
唯一的问题是，我很难确定如何使optgroup正常工作。我尝试了无数次，这真的开始让我感到沮丧。 以下是我想要的输出示例(示例)：
Employee 2
Employee 1
Employee 3
基本上，optgroup必须是“ groupname”，选项“ name”应该是“ emp_id”，而动作“ option”(下拉项)是“
empname”。
我希望这是可以做的，但是真的不确定。这是我所拥有的功能，但无法正常运行：
function getDynGrpList() {
global $db;
// $query = "SELECT * FROM employees ORDER BY grp_id desc;";
$query = "SELECT employees.emp_id,employees.empname,employees.grp_id,groups.groupname FROM employees left join groups on employees.grp_id = groups.grp_id order by groupname asc;";
$employees = $db->GetAll($query);
$groups = array();
while ($qa = $employees->GetRows()) {
$groups[$qa['groupname']][$qa['grp_id']] = $qa['empname'];
}
foreach ($groups as $label => $opt) { ?>
foreach ($groups[$label] as $id => $name) { ?>
从凌晨3:15 CST(2/27)开始的getDynGrpList函数：
function getDynGrpList() {
global $db;
// $query = "SELECT * FROM employees ORDER BY grp_id desc;";
$query = "SELECT employees.emp_id,employees.empname,employees.grp_id,groups.groupname FROM employees left join groups on employees.grp_id = groups.grp_id order by groupname asc;";
$employees = $db->GetAll($query);
$groups = array();
while ($qa = $employees->GetRows()) {
$groups[$qa['groupname']][$qa['emp_id']] = $qa['empname'];
}
var_export($groups);
foreach($groups as $label => $opt): ?>
<?php foreach ($opt as $id => $name): ?>
}
最终解决方案(在Felix Kling的帮助下)
function getDynGrpList() {
global $db;
$query = "SELECT employees.emp_id,employees.empname,employees.grp_id,groups.groupname FROM employees left join groups on employees.grp_id = groups.grp_id order by groupname asc;";
$employees = $db->GetAll($query);
$groups = array();
foreach ($employees as $employee) {
$groups[$employee['groupname']][$employee['emp_id']] = $employee['empname'];
}
foreach($groups as $label => $opt): ?>
<?php foreach ($opt as $id => $name): ?>
}
