round robin weighted round robin algorithm php implementation code

First enter the code, using php script language

 5, 'current_weight' => 0, 'count' => 0);
$hosts['b'] = array('weight' => 3, 'current_weight' => 0, 'count' => 0);
$hosts['c'] = array('weight' => 2, 'current_weight' => 0, 'count' => 0);
 
$result = array();
 
/* 模拟10次 */
for ($i = 0; $i < 10; $i++) {
  round_robin($hosts, $result);
}
 
/* 输出结果 */
print_r($result);
 
/* round robin 轮循 */
function round_robin(&$hosts, &$result)
{
  $total = 0;
  $best = null;
 
  foreach ($hosts as $key => $item) {
    $current = &$hosts[$key];
    $weight = $current['weight'];
 
    $current['current_weight'] += $weight;
    $total += $weight;
 
    if ( ($best == null) || ($hosts[$best]['current_weight'] < 
                $current['current_weight']) ) 
    {
      $best = $key;
    }
  }
 
  $hosts[$best]['current_weight'] -= $total;
  $hosts[$best]['count']++;
 
  $result[] = $best;
}

Output result:

Array
(
[0] => a
[1] => b
[2] => c
[3] => a
[4] => a
[5] => b
[6] => a
[7 ] => c
[8] => b
[9] => a
)

In a load-balanced server, one of its implementation algorithms is round-robin weighted round robin , that is, in the backend server list, each server is marked with a weight, representing its probability of being adopted.

This code strips out the simplest process, without considering back-end hangs and other situations. You can know how it is implemented, for reference only.

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