php去除数组中重复值,并返回结果!

关注

原创最新推荐文章于 2026-06-30 16:30:00 发布 3.6k 阅读 AI 写同款· GEO 优化 ›

PHP数组中处理重复元素的几种方法 array_count_values()函数可以统计数组中每个元素的出现次数，并返回一个新的关联数组，其中键是数组中的元素，值是该元素出现的次数。循环遍历原始数组，对于每个元素，使用in_array()函数检查该元素是否已经在新数组中存在。array_unique()函数是PHP内置的一个函数，它可以用来移除数组中的重复元素，并返回一个新的数组。array_keys()函数可以返回数组中所有键名的一个新数组，而array_diff()函数可以计算多个数组的差集。方法二：使用循环和in_array()函数。阅读详情

$data = db('order')->field('ordernum')->where(array('user_id' => $user_id))->select();
查询的数组格式
array(16) {
  [0] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [1] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [2] => array(1) {
    ["ordernum"] => string(18) "190415165656156213"
  }
  [3] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [4] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [5] => array(1) {
    ["ordernum"] => string(18) "190415170056183687"
  }
  [6] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [7] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [8] => array(1) {
    ["ordernum"] => string(18) "190415170345120966"
  }
  [9] => array(1) {
    ["ordernum"] => string(18) "190416174929158053"
  }
  [10] => array(1) {
    ["ordernum"] => string(18) "190416174929158053"
  }
  [11] => array(1) {
    ["ordernum"] => string(18) "190416194457158437"
  }
  [12] => array(1) {
    ["ordernum"] => string(18) "190416194457158437"
  }
  [13] => array(1) {
    ["ordernum"] => string(18) "190416195027154990"
  }
  [14] => array(1) {
    ["ordernum"] => string(18) "190416195027154990"
  }
  [15] => array(1) {
    ["ordernum"] => string(18) "190417124518178758"
  }
}

foreach ($data as $k => $v) {
$ordernum[] = $v['ordernum'];
}

ordernum数组格式

array(16) {
  [0] => string(18) "190415165656156213"
  [1] => string(18) "190415165656156213"
  [2] => string(18) "190415165656156213"
  [3] => string(18) "190415170056183687"
  [4] => string(18) "190415170056183687"
  [5] => string(18) "190415170056183687"
  [6] => string(18) "190415170345120966"
  [7] => string(18) "190415170345120966"
  [8] => string(18) "190415170345120966"
  [9] => string(18) "190416174929158053"
  [10] => string(18) "190416174929158053"
  [11] => string(18) "190416194457158437"
  [12] => string(18) "190416194457158437"
  [13] => string(18) "190416195027154990"
  [14] => string(18) "190416195027154990"
  [15] => string(18) "190417124518178758"
}

$ordernum = array_unique($ordernum); //去掉重复的字符串

去重后ordernum 数组格式

array(7) {
  [0] => string(18) "190415165656156213"
  [3] => string(18) "190415170056183687"
  [6] => string(18) "190415170345120966"
  [9] => string(18) "190416174929158053"
  [11] => string(18) "190416194457158437"
  [13] => string(18) "190416195027154990"
  [15] => string(18) "190417124518178758"
}

foreach ($ordernum as $k => $v) {
$new_ordernum[] = $v; //拆分后的重组
}

产生的新数组格式

array(7) {
  [0] => string(18) "190415165656156213"
  [1] => string(18) "190415170056183687"
  [2] => string(18) "190415170345120966"
  [3] => string(18) "190416174929158053"
  [4] => string(18) "190416194457158437"
  [5] => string(18) "190416195027154990"
  [6] => string(18) "190417124518178758"
}