如何用PHP代码实现教职员工管理系统

教职员工管理系统可以用PHP编写，以下是一个基本实现示例：

class Person {
    public $name;
    public $age;
    public $gender;
    public function __construct($name, $age, $gender) {
        $this->name = $name;
        $this->age = $age;
        $this->gender = $gender;
    }
}

class Employee extends Person {
    public $id;
    public $department;
    public $salary;
    public function __construct($name, $age, $gender, $id, $department, $salary) {
        parent::__construct($name, $age, $gender);
        $this->id = $id;
        $this->department = $department;
        $this->salary = $salary;
    }
}

class Teacher extends Employee {
    public $subjects;
    public function __construct($name, $age, $gender, $id, $department, $salary, $subjects) {
        parent::__construct($name, $age, $gender, $id, $department, $salary);
        $this->subjects = $subjects;
    }
}

class Staff extends Employee {
    public $duties;
    public function __construct($name, $age, $gender, $id, $department, $salary, $duties) {
        parent::__construct($name, $age, $gender, $id, $department, $salary);
        $this->duties = $duties;
    }
}

class ManagementSystem {
    public $employees = [];
    public function add_employee($employee) {
        $this->employees[] = $employee;
    }
    public function remove_employee($employee) {
        $key = array_search($employee, $this->employees);
        if ($key !== false) {
            unset($this->employees[$key]);
        }
    }
    public function search_employee($id) {
        foreach ($this->employees as $employee) {
            if ($employee->id == $id) {
                return $employee;
            }
        }
        return null;
    }
    public function list_employees() {
        foreach ($this->employees as $employee) {
            echo "{$employee->name} ({$employee->gender}), {$employee->age} years old, ID: {$employee->id}, Department: {$employee->department}, Salary: {$employee->salary}<br>";
        }
    }
}

// 示例使用
$ms = new ManagementSystem();

// 添加员工
$t1 = new Teacher("Tom", 35, "Male", "T001", "Math", 5000, ["Algebra", "Geometry"]);
$t2 = new Teacher("Mary", 30, "Female", "T002", "English", 4500, ["Literature", "Writing"]);
$s1 = new Staff("John", 25, "Male", "S001", "Security", 3000, "Guarding");
$s2 = new Staff("Lisa", 28, "Female", "S002", "Cafeteria", 3500, "Cooking");
$ms->add_employee($t1);
$ms->add_employee($t2);
$ms->add_employee($s1);
$ms->add_employee($s2);

// 查询员工
$e = $ms->search_employee("T002");
if ($e) {
    echo "Employee found: {$e->name}<br>";
} else {
    echo "Employee not found<br>";
}

// 列举员工
$ms->list_employees();

// 删除员工
$ms->remove_employee($s2);

// 列举员工
$ms->list_employees();

在上面的示例代码中，我们使用PHP定义了一个`Person`类作为基类，包含了姓名、年龄和性别等基本属性。然后我们定义了`Employee`类，作为一个员工类，继承了`Person`类的属性，并添加了员工的工号、部门和工资等属性。

之后我们又定义了`Teacher`类和`Staff`类，分别表示教师和职员，它们都是`Employee`类的子类，并添加了各自特有的属性。

最后我们定义了一个`ManagementSystem`类，作为员工管理系统，包含了添加、删除、查询和列举员工等方法。

我们在示例代码中通过实例化这些类，并调用相关方法，来演示了这个基本的教职员工管理系统的使用。您可以在此基础上进行扩展和完善，以满足自己的实际需求。