<?php

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    require_once('../conn.php');
    header("Content-Type: application/json");
    $d = new Department();
    echo $d->getDepartment();
}

class Department
{
    public function getDepartment()
    {
        global $conn;

        $sql_str = "
            SELECT
            * FROM( 
                SELECT 
                    '0' AS value,
                    '全部' AS text
                FROM department 

                UNION 

                SELECT 
                DISTINCT
                    department_id AS value,
                    name AS text
                FROM department 
            )AS tmp
            ORDER BY tmp.value
        ";
        $stmt = $conn->prepare($sql_str);
        $stmt->execute();
        $data = $stmt->fetchAll(PDO::FETCH_ASSOC);
        return json_encode($data, JSON_UNESCAPED_UNICODE);
    }
}