检查会话空

Question

我正在使用codeigniter框架。我在$this->session->userdata('sess_place')中设置了会话，但我无法使用if条件进行回应。也许我的if条件错了？

$pl = $this->session->userdata('sess_place');

if(isset($pl) && $pl = TRUE) {
   echo $pl;
}
else {
   echo "Select your city";
}

Answer 1

您使用了assign operater（=）而不是==，这是错误的。试试这个：

$pl = $this->session->userdata('sess_place');
if(isset($pl) && $pl == true) // and also no need of isset($pl) here jusy if($pl == TRUE) is enough
  {
   echo $pl;
  }
else
  {
    echo "Select your city";
  }

Answer 2

这应该适合你：

$pl = $this->session->userdata('sess_place');
if(!empty($pl)) {
   echo $pl;
} else {
   echo "Select your city";
}

Answer 3

尝试从会话中获取数据。如果它返回false以外的其他内容，则必须设置它。尝试使用 -

if ($this->session->userdata('sess_place')) {
    echo $this->session->userdata('sess_place');
} else {
    echo "Select your city";
}

Answer 4

如果您在会话中存储布尔值，请尝试此操作。

$pl = $this->session->userdata('sess_place');
if(isset($pl) && $pl === true) // this checks value and its data type
{
   echo "Got it";
}
else
{
    echo "Select your city";
}