How to use PHP to randomly extract a specified number of subsets from an array

This article is an introduction to how to use PHP to randomly extract a specified number of subsets from an array. It has certain reference value. Friends in need can take a look.

#Key: The array_rand() function returns a random key in an array, or an array containing random keys if you specify that the function returns more than one key.

#Idea: First use array_rand() to randomly retrieve the required number of key names, and then recombine the values ​​pointed to by these key names into an array

/**
   * 数组中取出随机取出指定数量子值集
   * @param $array array
   * @param $count int
   * @return array
   */
  function rand_arr_from_array($array, $count)
  {
    !is_int($count) && $count = intval($count);

    if ($count < 0) return false;

    $_arr_return = array();

    if ($count >= count($array)) {
      $_arr_return = $array;
    } else if ($count > 0) {
      $temp = array_rand($array, $count);//随机返回指定数量键值 $count > 1 返回键值数组，$count = 1 返回键值字符串，

      if ($count == 1) $temp = array($temp);

      //重组数组
      foreach ($temp as $val) $_arr_return[] = $array[$val];
    }

    return $_arr_return;
  }

  $_arr_str = array(&#39;你&#39;, &#39;看&#39;, &#39;我&#39;, &#39;哪&#39;, &#39;里&#39;, &#39;像&#39;, &#39;好&#39;, &#39;人&#39;);
  $_count_random = &#39;3&#39;;
  print_r(rand_arr_from_array($_arr_str, $_count_random));

Related tutorials: PHP video tutorial

The above is the detailed content of How to use PHP to randomly extract a specified number of subsets from an array. For more information, please follow other related articles on the PHP Chinese website!