Example of implementing two-dimensional array deduplication function in PHP-PHP Tutorial-php.cn

Example of implementing two-dimensional array deduplication function in PHP

高洛峰

Release： 2023-03-04 20:04:02

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The example of this article describes the implementation of two-dimensional array deduplication function in PHP. Share it with everyone for your reference, the details are as follows:

Deduplication operation of two-dimensional array in php. For example, the records queried from the database are deduplicated based on a certain key.

The code is as follows:

/**
 * 删除二维数组中相同项的数据，（一般用于数据库查询结果中相同记录的去重操作）
 *
 * @param array $_2d_array 二维数组，类似：
 *     $tmpArr = array(
 *         array(&#39;id&#39; => 1, &#39;value&#39; => &#39;15046f5de5bb708e&#39;),
 *         array(&#39;id&#39; => 1, &#39;value&#39; => &#39;15046f5de5bb708e&#39;),
 *     );
 * @param string $unique_key 表示上述数组的 "id" 键，或者 "value" 键
 *
 * @return mixed
 */
function unique_2d_array_by_key($_2d_array, $unique_key) {
  $tmp_key[] = array();
  foreach ($_2d_array as $key => &$item) {
    if ( is_array($item) && isset($item[$unique_key]) ) {
      if ( in_array($item[$unique_key], $tmp_key) ) {
        unset($_2d_array[$key]);
      } else {
        $tmp_key[] = $item[$unique_key];
      }
    }
  }
  return $_2d_array;
}
//使用示例：
$tmpArr = array(
  array(&#39;id&#39; => 1, &#39;value&#39; => &#39;15046f5de5bb708e&#39;),
  array(&#39;id&#39; => 1, &#39;value&#39; => &#39;15046f5de5bb708e&#39;),
);
print_r(@unique_2d_array_by_key($tmpArr,id));

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Running results:

Array ( [0] => Array ( [id] => 1 [value] => 15046f5de5bb708e ) )

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Principle: Save the keys in the second-dimensional array that need to be deduplicated, traverse and compare the next set of data, and delete them if the key values are the same.

I hope this article will be helpful to everyone in PHP programming.

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