php - Custom class method returns error

Question

{Code...} {Code...} Error Warning: Missing argument 1 for Input::post(), Notice: Undefined variable: key

PHP中文网 · Answer

Solution:

class Input{
  public function post($key){
        if(isset($_POST[$key])){
            $val=$_POST[$key];
            return $val;
        }
        
  }


$input=new Input();
$upSet=$input->post("demo");
var_dump($upSet);

世界只因有你 · Answer

function post($key = 'default'){}

仅有的幸福 · Answer

Write less closing curly braces below the Input class }
In addition, there are no parameters passed in the post method