Сергей Соколов

00 01 02
10 11 12
20 21 22

00        :  0+0 = 0
10, 01    :  1+0 = 0+1 = 1
20, 11, 02:  2+0 = 1+1 = 0+2 = 2

var arr = [
  'o,x,x'.split(','),
  'x,o,o'.split(','),
  'o,x,o'.split(','),
];

var r, c, key, diags = {};
for(r = 0; r < arr.length; r++) {
  for(c = 0; c < arr[r].length; c++) {
    key = r + arr[r].length - 1 - c; // слева сверху вправо вниз
    // key = r + c; // слева снизу вправо вверх
    
    if( diags.hasOwnProperty(key)) {
      if( diags[key] !== arr[r][c]) diags[key] = false;
    } else {
      diags[key] = arr[r][c];
    }
  }
}

for( key in diags) if( diags[key] === false) delete diags[key];
// {"0":"x","2":"o","3":"x","4":"o"}

function user_params(id, param, callback) {
  vk('users.get', {user_ids: id, fields: param}, function(error, response){
    if (error) {
      console.log(error);
    } else callback(response[0][param]);
  });
};

$date = new DateTime();
$date->setTimezone( new DateTimeZone('+0300')); // тут ваш часовой пояс
echo $date->format('d.m.Y H:i:s') . "\n";

function roundTS(ts) {
  var D = new Date(ts);
  var m = 15 + Math.ceil( D.getMinutes() / 15);
  D.setMinutes(m);
  return D.getTime();
}

function roundMinArr( D, arr) {
  var i, m = D.getMinutes();  
  arr.sort((a,b)=>a-b);
  for(i in arr) {
    if( arr[i] < m) continue;
    D.setMinutes(arr[i]);
    return D;
  }
  D.setMinutes(60 + arr[0]);
  return D;
}

var D = roundMinArr( new Date('2017-08-16T12:17+03:00'), [0,15,35,44,59]);
D.toString() // Wed Aug 16 2017 12:35:00 GMT+0300 (MSK)

function getById( obj, id) {
  var i, found;
  if( obj.id === id) return obj;
  if( obj.hasOwnProperty('childGroups')) {
    for( i in obj.childGroups) {
      if( found = getById( obj.childGroups[i], id)) return found;
    }
  }
  return;
}

getById( obj,3) // {"id":3,"parentId":1,"childGroups":[{"id":6,"parentId":3},{"id":7,"parentId":3}]}

function countSymbols(s) {
  return s.split('').reduce(
    (p,c) => (p.hasOwnProperty(c)?p[c]++:p[c]=1, p), {}
  );
}
var r = countSymbols('hello'); // {"h":1,"e":1,"l":2,"o":1}

function bad( obj, name) {
  return eval('obj.' + name);     
}
bad(r, 'foo.bar'); // 'value'

function better( obj, name) {
  var parts = name.split('.'), i, cursor = r;
  
  for( i = 0; i < parts.length; i++) {
    if( !cursor.hasOwnProperty( parts[i])) throw('No such property: ' + parts[i]);
    cursor = cursor[parts[i]];
  }
  
  return cursor;
}

better(r, 'foo.bar'); // 'value'

$date = new DateTime();
$date->setTimezone( new DateTimeZone('+0000'));
$date->setTimestamp( time());
$date->add(new DateInterval('PT2H')); // добавим 2 часа про запас – просят же больше текущей

echo $date->format('c') . "\n";