数组操作-将下标变成从0开始的连续数字

数组$arr

array (size=3)
  0 => 
    array (size=2)
      'channel' => int 0
      'num' => int 170
  13 => 
    array (size=2)
      'channel' => int 1
      'num' => int 6
  14 => 
    array (size=2)
      'channel' => int 2
      'num' => int 2

使用foreache函数

foreach($arr as $value){
    $new[] = $value;
}

变化后的数组$new

array (size=3)
  0 => 
    array (size=2)
      'channel' => int 0
      'num' => int 170
  1 => 
    array (size=2)
      'channel' => int 1
      'num' => int 6
  2 => 
    array (size=2)
      'channel' => int 2
      'num' => int 2