get - PHP is_nan function: Notice: A non well formed numeric value encountered -



I want to check that the $ _GET method is an AN code (only numeric) and check that There is a number when it does not happen to two, then I want to redirect to another page, and want to exit php script. 

  if (! Isset ($ _GET ["ean"])) {header ('location: /products.php'); Go out(); } Else {if (is_nan ($ _ receive ["EAN"])) {header ('location: /products.php'); Go out(); }}   
 When the $ _GET ["ean"] = 234234 SD (therefore, it is not numeric) is a php error: 
  Notice: a non-well Created in the numerical value created ..... line 9 is the line with 9D is_nan function.  
  
 
 
 
 
 
  
 There is a boat. View the docs:  
 For this reason,  is_nan  wants a  as the name of a parameter . It will tell you whether it is Nain or not.  
 In your case, you want  is_numeric .  
  if (! Is_numeric ($ _GET ["EAN"])) {}

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