PHP/Laravel, foraeach: ($array as $value) works, ($array as $key => $value) does not?! -

i have no idea how explain question in way giving example. hope ok.

i defined 2 arrays:

$range = ['1000' => '1100', '1100' => '1200', '1200' => '1300']; 

and

$years = ['2010', '2011']; 

then try data given database like:

        foreach ($years $year) {         foreach ($range $from => $to) {             $result[$year][$from] = flight::leftjoin('aircrafts', 'flights.lfz_lfdnr', '=', 'aircrafts.lfz_lfdnr')                 ->selectraw('aircrafts.gewicht, sum(flights.anzldg) landungen')                 ->whereyear('datum', '==', $year)                 ->where('gewicht', '>=', $from)                 ->where('gewicht', '<', $to)                 ->count();         };     }; 

which works output like:

{  "2010": {     "1000": 821,     "1100": 979,     "1200": 126,     "1300": 127,     "1400": 69,     "1500": 157,     "1600": 33,     "1700": 364,     "1800": 64,     "1900": 69 }, "2011": {     "1000": 891,     "1100": 1027,     "1200": 112,     "1300": 128,     "1400": 76,     "1500": 135,     "1600": 64,     "1700": 701,     "1800": 96,     "1900": 67 } 

}

i changed $years array to:

$years = ['2010'=>'red','2011'=>'green']; 

and query to:

        foreach ($years $year => $color) {         foreach ($range $from => $to) {             $result[$year][$from] = flight::leftjoin('aircrafts', 'flights.lfz_lfdnr', '=', 'aircrafts.lfz_lfdnr')                 ->selectraw('aircrafts.gewicht, sum(flights.anzldg) landungen')                 ->whereyear('datum', '==', $year)                 ->where('gewicht', '>=', $from)                 ->where('gewicht', '<', $to)                 ->count();         };     }; 

what got:

{  "2010": {     "1000": 0,     "1100": 0,     "1200": 0,     "1300": 0,     "1400": 0,     "1500": 0,     "1600": 0,     "1700": 0,     "1800": 0,     "1900": 0 }, "2011": {     "1000": 0,     "1100": 0,     "1200": 0,     "1300": 0,     "1400": 0,     "1500": 0,     "1600": 0,     "1700": 0,     "1800": 0,     "1900": 0 } 

}

and have no idea why "0"! when try debug , check $year var, still has correct value. if insert e.g. '2010' instead of $year in ->whereyear(), works well. have no idea causes problem. welcome.

many thanks!