个回答

• 何明洋洋洋

  2017-06-18 13:04:15

  <?php 
  function get_rand_arr($total_count,$get_count){
  if($total_count<1 or $get_count<1){
  exit('非法个数！');
  }
  if($total_count<$get_count){
  exit('取出元素个数不能大于总数！');
  }
  $source_arr = array();
  for($i=0;$i<$total_count;$i++){
  array_push($source_arr,$i);
  }
  $result_arr = array();
  if($get_count>$total_count/2){
  $return_arr = &$source_arr;
  }else{
  $return_arr = &$result_arr;
  }
  $get_count = min($get_count,$total_count-$get_count);
  while(count($result_arr)<$get_count){
  $rand_num = mt_rand(0,count($source_arr)-1);
  array_push($result_arr,$source_arr[$rand_num]);
  array_splice($source_arr,$rand_num,1,array());
  }
  return $return_arr;
  }
  
  
  $result = get_rand_arr(10,6);
  var_dump($result);
  ?>

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