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This article mainly introduces the method of sorting a certain key of a two-dimensional array in PHP, involving PHP's operation skills for array traversal, comparison, sorting and other related operations. Friends in need can refer to the following
for details As follows:
/** * 对查询结果集进行排序 * @access public * @param array $list 查询结果 * @param string $field 排序的字段名 * @param string $sortby 排序类型 (asc正向排序 desc逆向排序 nat自然排序) * @return array */ function list_sort_by($list, $field, $sortby = 'asc') { if (is_array($list)) { $refer = $resultSet = array(); foreach ($list as $i => $data) { $refer[$i] = &$data[$field]; } switch ($sortby) { case 'asc': // 正向排序 asort($refer); break; case 'desc': // 逆向排序 arsort($refer); break; case 'nat': // 自然排序 natcasesort($refer); break; } foreach ($refer as $key => $val) { $resultSet[] = &$list[$key]; } return $resultSet; } return false; } /** * 例子 * 求:根据二维数组的id键值降序排列(也就是id越大的排在越前)? */ $list = array( 0 => array( 'id' => 1, 'name' => '第一' ), 1 => array( 'id' => 3, 'name' => '第三' ), 2 => array( 'id' => 2, 'name' => '第二' ), 3 => array( 'id' => 4, 'name' => '第四' ), ); //解答 $new_list = list_sort_by($list, 'id', 'desc'); print_r($new_list);
The running results are as follows:
Array ( [0] => Array ( [id] => 4 [name] => 第四 ) [1] => Array ( [id] => 3 [name] => 第三 ) [2] => Array ( [id] => 2 [name] => 第二 ) [3] => Array ( [id] => 1 [name] => 第一 ) )
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