PHP之根据树形数组生成table表格并且合并单元格

数据格式如下：

 0 => 
    array (size=12)
      'root_id' => string '0' (length=1)
      'parent_id' => string '0' (length=1)
      'field_id' => string '10' (length=2)
      'field_name' => string '测试指标1' (length=13)
      'order_num' => string '1' (length=1)
      'path' => string '1' (length=1)

  1 => 
    array (size=12)
      'root_id' => string '10' (length=2)
      'parent_id' => string '10' (length=2)
      'field_id' => string '16' (length=2)
      'field_name' => string '指标1-2' (length=9)
      'order_num' => string '1' (length=1)
      'path' => string '2' (length=1)
    
  2 => 
    array (size=12)
      'root_id' => string '10' (length=2)
      'parent_id' => string '16' (length=2)
      'field_id' => string '17' (length=2)
      'field_name' => string '指标1-2-1' (length=11)
      'order_num' => string '2' (length=1)
      'path' => string '3' (length=1)
  3 => 
    array (size=12)
      'root_id' => string '10' (length=2)
      'parent_id' => string '16' (length=2)
      'field_id' => string '18' (length=2)
      'field_name' => string '指标1-2-1-1' (length=13)
      'order_num' => string '2' (length=1)
   
  4 => 
    array (size=12)
      'root_id' => string '10' (length=2)
      'parent_id' => string '16' (length=2)
      'field_id' => string '21' (length=2)
      'field_name' => string '指标1-2-1-1' (length=13)
      'order_num' => string '2' (length=1)
      'path' => string '3' (length=1)
     

构思：
1、将数组先组合成

 // array(
            //   [ 'z1'=>'测试指标1',
            //     'z2'=>'指标1-2',
            //     'z3'=>'指标1-2-1',
            //     ],
            //   [
            //     'z1'=>'测试指标1',
            //     'z2'=>'指标1-1',
            //     'z3'=>'指标1-1-1',
            //   ]
            // )

2、然后在合并

代码如下:

   /**
     * 数据集合循环递归
     *
     * @return void
     */
    public function getTrees($data = [], $pid = 0)
    {
        static $list = [];
        foreach ($data as $key => $vals) {
            if ($vals['parent_id'] == $pid) {
                $list[] = $vals;
                unset($data[$key]);
                $this->getTrees($data, $vals['field_id']);
            }
        }

        return $list;
    }

  $trees = $this->getTrees($fields);


 foreach ($trees ?? [] as $key => $vals) {
                if ($vals['root_id'] == 0) {

                    $treedata[$vals['field_id']][$vals['path']] += 1;
                    $treedata[$vals['field_id']]['counts'] = $i;
                } else {
                    $i++;
                    $treedata[$vals['root_id']][$vals['path']] += 1;
                    $treedata[$vals['root_id']]['counts'] = $i;
                }
            }
$mpath=4; //最大列数


 $mergeData = [];
            $datas = [];
            $data_array = [];
            //先根据数值获取最大的行数
            $slice_max = 0;
            $key = 0;
            foreach ($treedata as $keys => $vals) {

                if ($key == 0)  $slice_max = 0;
                $slice_array = array_slice($trees ?? [], $slice_max, $vals['counts']);
                $max_array = end($vals);

                if ($max_array <= 0) {
                    continue;
                }
                //开始数据组合 先组行数
                foreach (range(1, $max_array) as $ks => $vs) {

                    $mergeData = [];
                    //数据循环来换行
                    foreach ($slice_array ?? [] as $ks1 => $vs1) {
                        $mergeData['z' . $vs1['path']] = $vs1['field_name'];
                
                        if ($vs1['path'] == $mpath) {

                            unset($slice_array[$ks1]);

                            break;
                        }
                    }


                    $data_array[] = $mergeData;
                }

                $key++;
                $slice_max += $vals['counts'];
            }

  $mreges = $this->mergeTables($data_array);


 public function mergeTables($arrays = [], $columns = ['z1', 'z2'])
    {
        //计算数据合并
        foreach ($columns as $key1 => $vals1) {
            $mrege = 1;
            //数据开始循环
            foreach ($arrays as $key => $vals) {
                if ($arrays[$key][$vals1] == $arrays[$key - 1][$vals1]) {
                    //数据合并
                    $mrege += 1;
                    $datas[$vals[$vals1]] = $mrege;
                } else {
                    $mrege = 1;
                }
            }
        }

        return $datas;
    }



            $tables = $this->getTableds($data_array, $mreges);



 /**
     * 组合数据结果
     *
     * @param [type] $mpath
     * @param [type] $fields
     * @param [type] $trees
     * @return void
     */
    public function getTableds($arrays, $mreges)
    {

        $htmls = '';
        $counts = [];
        foreach ($arrays as $key => $vals) {
            $strs = '<tr>';

            //第一个数据进行rowsoan 剩下的不写

            $columns = ['z1', 'z2', 'z3'];

            foreach ($columns as $k1) {

                if (empty($mreges[$vals[$k1]])) {
                    $strs .= '<td>' . $vals[$k1] . '</td>';
                }
                //有rowsoan数据
                if ($mreges[$vals[$k1]] > 0) {
                    $counts[$vals[$k1]] += 1;

                    if ($counts[$vals[$k1]] == 1) {
                        $rowspan = ' rowspan="' . $mreges[$vals[$k1]] . '"';
                        $strs .= '<td' . $rowspan . '>' . $vals[$k1] . '</td>';
                    }
                }
            }
            $strs .= '<td>' . $vals['gcdian'] . '</td>';
            $strs .= '<td>' . $vals['flzcyj'] . '</td>';
            $strs .= '<td>' . $vals['sbcl'] . '</td>';
            $strs .= '<td>' . $vals['ckfz'] . '</td>';
            $strs .= '</tr>';
            $htmls .= $strs;
        }

        return $htmls;
    }

样子: