Creating a PHP function -


so i'm trying create php function track visitors. reason why want function of because not want copy/paste code every page i'll using tracker. must confess php functions weakest. appreciated.

this current function:

function visitor_ip_data($ip_city) {      if(!isset($_session['ip_country']) || !isset($_session['ip_city']) || !isset($_session['ip_postal']) || !isset($_session['ip_region']) || !isset($_session['ip_isp']) ) {         //niet geset, haal nieuwe ip data op         $url = file_get_contents('http://api.ipaddresslabs.com/iplocation/v1.8/locateip?key=my-key-goes-here&ip='.$_server['remote_addr'].'&format=json');         $html = json_decode($url);          if ($html->query_status->query_status_code != 'ok') {             //api data error             //destroy sessions             unset($_session['ip_city']);             unset($_session['ip_postal']);             unset($_session['ip_region']);             unset($_session['ip_country']);             unset($_session['ip_isp']);              //echo "error! ".$html->query_status->query_status_description." ";             //die();         } else {             //api data success             //create sessions             $feed = $html->geolocation_data;              $_session['ip_city'] = $feed->city;             $_session['ip_postal'] = $feed->postal_code;             $_session['ip_region'] = $feed->region_name;             $_session['ip_country'] = $feed->country_name;             $_session['ip_isp'] = $feed->isp;              $ip_city = $_session['ip_city'];             $ip_postal = $_session['ip_postal'];             $ip_region = $_session['ip_region'];             $ip_country = $_session['ip_country'];             $ip_isp = $_session['ip_isp'];              //echo "gathered ip data api";             //die();         }       } else {         //ip data in sessions         //use sessions         $ip_city = $_session['ip_city'];         $ip_postal = $_session['ip_postal'];         $ip_region = $_session['ip_region'];         $ip_country = $_session['ip_country'];         $ip_isp = $_session['ip_isp'];          //echo "using ip data sessions";         //die();     }  }

what i'm trying echoíng $ip_city on page using function. part of page code following:

echo visitor_ip_data($ip_city);

but gives me undefined variable error message. i'm wondering why it's doing that. missing or doing wrong?

thank you.

you don't return function.

remove argument function definition : function visitor_ip_data()

write

      //echo "error! ".$html->query_status->query_status_description." ";       return null;      } else {         //api data success         //create sessions         $feed = $html->geolocation_data;          $_session['ip_city'] = $feed->city;         $_session['ip_postal'] = $feed->postal_code;         $_session['ip_region'] = $feed->region_name;         $_session['ip_country'] = $feed->country_name;         $_session['ip_isp'] = $feed->isp;          $data['ip_city'] =  = $_session['ip_city'];         $data['ip_postal'] = $_session['ip_postal'];         $data['ip_region'] = $_session['ip_region'];         $data['ip_country'] = $_session['ip_country'];         $data['ip_isp'] = $_session['ip_isp'];          //echo "gathered ip data api";         //die();     }   } else {     //ip data in sessions     //use sessions     $data['ip_city'] = $_session['ip_city'];     $data['ip_postal'] = $_session['ip_postal'];     $data['ip_region'] = $_session['ip_region'];     $data['ip_country'] = $_session['ip_country'];     $data['ip_isp'] = $_session['ip_isp'];      //echo "using ip data sessions";     //die();     }     return $data;

and then

if (($data = visitor_ip_data()) == null) echo 'error'; else echo $data['ip_city'];

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