phparrayscodeignitercounterundefined-index

How to increment a potentially undefined variable?

Looking to get a count of particular key=>values in an multi dimensional array. What I have works i.e. the result is correct, but I can't seem to get rid of the Undefined Index notice.

$total_arr = array();

foreach($data['user'] as $ar) {
     $total_arr[$ar['city']]++;
}

print_r($total_arr);

Any ideas? I have tried isset() within the foreach loop, but no joy.

Solution 
  • $total_arr = array();

foreach($data['user'] as $ar) {
    if(array_key_exists($ar['city'],$total_arr) {
        $total_arr[$ar['city']]++;
    } else {
        $total_arr[$ar['city']] = 1; // Or 0 if you would like to start from 0
    }
}    

print_r($total_arr);