Question

我有Session::get('employee_leave_tag');，其中包含payroll_leave_employee_id，因为data不仅是我使用foreach循环的public function get_session_leave_tagv2() { $employee = [0 => 0]; if(Session::has('employee_leave_tag')) { $employee = Session::get('employee_leave_tag'); } $empdata = array(); foreach($employee as $emp) { $employee_id = Tbl_payroll_leave_employeev2::select('payroll_employee_id') ->join('tbl_payroll_leave_schedulev2','tbl_payroll_leave_employee_v2.payroll_leave_employee_id','=','tbl_payroll_leave_schedulev2.payroll_leave_employee_id') ->where('tbl_payroll_leave_schedulev2.payroll_leave_employee_id',$emp) ->distinct() ->get(); if(count($employee_id) == 0) { $empa = Tbl_payroll_employee_basic::join('tbl_payroll_leave_employee_v2','tbl_payroll_leave_employee_v2.payroll_employee_id','=','tbl_payroll_employee_basic.payroll_employee_id')->whereIn('tbl_payroll_leave_employee_v2.payroll_leave_employee_id',$emp)->get(); array_push($empdata,$empa); } else { $empb = Tbl_payroll_leave_schedulev2::getallemployeeleavedata($employee_id)->get(); array_push($empdata,$empb); } } $data['new_record'] = $empdata; return json_encode($data); }。但我有一个错误

为foreach（）提供的参数无效

有人可以帮我解决导致此错误的原因吗？感谢。

$array = [];

if($array == []) {
    // array is empty
}

Answer 1

您需要在代码中进行两处更改。

第一次更改： 您的数组声明$employee = array();或$employee[];

第二次更改： 在编写if循环之前，使用foreach条件检查变量是否为数组并且不为空是一个很好的做法。它将使我们免于您所面临的错误。

if(is_array($employee) && !empty($employee))
{
    foreach($employee as $emp)
    {
    }
}

Answer 2

尝试这个...

{ $group: null, count: {$sum: 1} }

LARAVEL为foreach（）循环提供的参数无效

2 个答案: