PHP infinite classification implementation program_PHP tutorial

This article summarizes two PHP infinite classification implementation program codes. Friends who need to learn can refer to them.

Main idea: First look at the third and fourth rows. The value of the parent class ID (PARENTID) is 1, which means it belongs to a subclass of the class with id=1. The first and second rows are first-level classifications. , there is no superior classification, so the value of the parent class ID (PARENTID) is 0, indicating the primary classification, and so on to achieve infinite classification. The final effect is:
├First-level classification A
├─┴Second-level classification A
├─┴Second-level classification B
├First-level classification B
Then there is the program, here As a description language, PHP can be easily changed to other languages ​​because the principle is similar, it is just recursion.

The code is as follows	Copy code
代码如下	复制代码
$dbhost = "localhost";   // 数据库主机名 $dbuser = "root";   // 数据库用户名 $dbpd = "123456";   // 数据库密码 $dbname = "test";   // 数据库名 mysql_connect($dbhost,$dbuser,$dbpd);       //连接主机 mysql_select_db($dbname);       //选择数据库 mysql_query("SET NAMES 'utf8'"); display_tree("├",0); function display_tree($tag,$classid) {     $result = mysql_query("         SELECT *         FROM ylmf_class         WHERE parentid = '" . $classid . "'         ;"     );     while ($row = mysql_fetch_array($result)) {         // 缩进显示节点名称   echo $tag.$row['classname'] . " ";         //再次调用这个函数显示子节点的子节点   display_tree($tag."─┴",$row['id']);     } } ?>

$dbhost = "localhost"; // Database host name

$dbuser = "root"; // Database user name
$dbpd = "123456" ; // Database password
$dbname = "test"; // Database name

mysql_connect($dbhost,$dbuser,$dbpd); //Connect to host

代码如下	复制代码
array( * 1 => array('id'=>'1','parentid'=>0,'name'=>'一级栏目一'), * 2 => array('id'=>'2','parentid'=>0,'name'=>'一级栏目二'), * 3 => array('id'=>'3','parentid'=>1,'name'=>'二级栏目一'), * 4 => array('id'=>'4','parentid'=>1,'name'=>'二级栏目二'), * 5 => array('id'=>'5','parentid'=>2,'name'=>'二级栏目三'), * 6 => array('id'=>'6','parentid'=>3,'name'=>'三级栏目一'), * 7 => array('id'=>'7','parentid'=>3,'name'=>'三级栏目二') * )

mysql_select_db($dbname); //Select Databasemysql_query("SET NAMES 'utf8'");display_tree("├",0);function display_tree($tag,$classid) { $result = mysql_query(" SELECT * FROM ylmf_class WHERE parentid = '" . $classid . "' ;" ); while ($row = mysql_fetch_array($result )) { // Extinction Show Node Name Echo $ Tag. $ Row ['ClassName']. display_tree($tag."─┴",$row['id']); }}?> In the table Displayed in TreeTable achieves infinite levels by merging rows and columns of cells and can better display the hierarchical structure. 1. Construct an array of ID/PID/NAME, and later generate dynamic data through the database. For Tree algorithm, please click

The code is as follows

Copy code

array(* 1 => array('id'=>'1','parentid'=>0,'name'=>'Level 1 Column one'),* 2 => array('id'=>'2','parentid'=>0,'name'=>'First-level column two'), * 3 => array('id'=>'3','parentid'=>1,'name'=>'Second-level column one'),* 4 => array(' id'=>'4','parentid'=>1,'name'=>'Second-level column two'),* 5 => array('id'=>'5' ,'parentid'=>2,'name'=>'Second-level column three'),* 6 => array('id'=>'6','parentid'=>3 ,'name'=>'Third-level column one'),* 7 => array('id'=>'7','parentid'=>3,'name'=>' Third level column 2')* )

2. Import the TreeTable class library.

The code is as follows:
import('@.ORG.Util.TableTree'); //Thinkphp import method
3. Generate TreeTable HTML code

$treeTable->init($treearr);
echo $treeTable->get_treetable();
Note: get_treetable() only produces the table body part, please do it yourself Build.
Complete code

";
foreach ($this->arr as $v){
if($v['row'] == $row){
$rowspan = $v['rowspan'] ? "rowspan='{$v['rowspan']}'" : '';
$colspan = $v['colspan'] ? "colspan='{$v['colspan']}'" : '';
$table_string .= "rtt";
}
}
$table_string .= "rt";
}
return $table_string;
}
}
?>

The code is as follows	Copy code
/** * File name: TreeTable.class.php * Author: run.gao 312854458@qq.com Date: 2012-07-24 23:22 GMT+8 * Description: Universal table with unlimited levels Category **/ /** * Table display of unlimited categories is to display wireless categories in the form of a table, which can better reflect the affiliation of the categories * Usage method: * 1. Instantiate the category * $ treeTable = new TreeTable(); * 2. Initialize classification, $treearr must be a multi-dimensional array and contain id, parentid, name fields * $treeTable->init($treearr); * 3. Get unlimited classification HTML code * echo $treeTable->get_treetable(); **/ class TreeTable { /** * 2-dimensional array required to generate tree structure * @var array */ public $arr = array(); /** * Number of table columns * @var int */ public $columns = 0; /** * Number of table rows * @var int */ public $rows = 0; /** * Initialize TreeTable data * @param array 2-dimensional array * array( * 1 => array('id'=>'1','parentid'=>0 ,'name'=>'First-level column one'), * 2 => array('id'=>'2','parentid'=>0,'name'=>' First-level column two'), * 3 => array('id'=>'3','parentid'=>1,'name'=>'Second-level column one'), * 4 => array('id'=>'4','parentid'=>1,'name'=>'Second-level column two'), * 5 => array ('id'=>'5','parentid'=>2,'name'=>'Second-level column three'), * 6 => array('id'=>' 6','parentid'=>3,'name'=>'Third-level column one'), * 7 => array('id'=>'7','parentid'=> ;3,'name'=>'Third-level column two') * ) */ public function init($arr=array()){ if(!is_array($arr)) return false; foreach ($arr as $k=> ;$v) { $this->arr[$v['id']] = $v; } foreach ($this->arr as $k => $v ){ $this->arr[$k]['column'] = $this->get_level($v['id']); // Y-axis position $this-> arr[$k]['arrchildid'] = $this->get_arrchildid($v['id']); // All child nodes $this->arr[$k]['arrparentid'] = $this->get_arrparentid($v['id']); // All parent nodes $this->arr[$k]['child_bottom_num'] = $this->get_child_count($v ['id']); // All underlying element nodes } $this->columns = $this->get_columns(); // Total number of rows $this->rows = $this->get_rows(); //Total number of columns // Sort by arrparentid and id number $this->sort_arr(); foreach ($this->arr as $k => $v){ $this->arr[$k]['row'] = $this->get_row_location($v['id']); // X-axis position $this->arr[$k]['rowspan'] = $v['child_bottom_num']; // Number of rows merged $this->arr[$k]['colspan'] = $v['child_bottom_num'] == 0 ? $this->columns - $v['column'] + 1 : 0; //Number of column merges } return $this->get_tree_arr( ); } /** * Get array **/ public function get_tree_arr(){ return is_array($this->arr) ? $this->arr : false; } /** * Reorder the array by arrparentid/id number **/ public function sort_arr(){ // Field to be sorted foreach ($this->arr as $k => $v){ $order_pid_arr[$k] = $v['arrparentid']; $order_iscost[] = $v['sort']; $order_id_arr[$k] = $v ['id']; } // Sort by arrparentid first, then sort by id number array_multisort( $order_pid_arr, SORT_ASC, SORT_STRING, $order_iscost, SORT_DESC, SORT_NUMERIC, $order_id_arr, SORT_ASC, SORT_NUMERIC, $this->arr); // Get each node level for ($column = 1; $column columns; $column++) { $row_level = 0; foreach ($this->arr as $key => $node){ if ($node['column'] == $column){ $row_level++; $this->arr[$key]['column_level'] = $row_level; } } } / / Recalculate using ID as key name foreach ($this->arr as $k=>$v) { $arr[$v['id']] = $v; } $this->arr = $arr; } /** * get parent array * @param int * @return array */ public function get_parent($myid){ $newarr = array(); if(!isset($this->arr[$myid])) return false; $pid = $this->arr[$myid]['parentid']; $pid = $this->arr[$pid]['parentid']; if(is_array($this->arr)){ foreach($this->arr as $id => $a){ if($a['parentid'] == $pid) $newarr[$id] = $a; } } return $newarr; } /** * Get the child array * @param int * @return array */ public function get_child($myid){ $a = $newarr = array(); if(is_array($this->arr)) { foreach($this->arr as $id => $a){ if($a['parentid'] == $myid) $newarr[$id] = $a; } } return $newarr ? $newarr : false; } /** * Get the level of the current node * @param $myid Current node ID number **/ public function get_level($myid, $init = true){ static $level = 1; if($init) $level = 1; if ($this->arr[$myid]['parentid']) { $level++; $this->get_level($this->arr[$myid]['parentid'], false); } return $level; } /** * Get the number of all underlying nodes (nodes without child nodes) of the current node * @param $myid Node ID number * @param $init Static variable will be loaded for the first time **/ public function get_child_count($myid, $init = true){ static $count = 0; if($init) $count = 0; if(!$this->get_child($myid) && $init) return 0; if($childarr = $this->get_child($myid)){ foreach ($childarr as $v){ $this->get_child_count($v['id'], false); } }else{ $count++; } return $count; } /** * Get the ID numbers of all child nodes of the node * @param $catid Node ID number * @param $init The first load will statically initialize the situation **/ public function get_arrchildid($myid, $init = true) { static $childid; if($init) $childid = ''; if(!is_array($this->arr)) return false; foreach($this->arr as $id => $a){ if($a['parentid'] == $myid) { $childid = $childid ? $childid.','.$a['id'] : $a['id']; $this->get_arrchildid($a['id'], false); } } return $childid ; } /** * Get the ID numbers of all parent nodes of this node * @param $id node ID number **/ public function get_arrparentid($id, $arrparentid = '') { if(!is_array($this->arr)) return false; $parentid = $this->arr[$id]['parentid']; if($parentid > 0) $arrparentid = $arrparentid ? $parentid.','.$arrparentid : $parentid; if($parentid) $arrparentid = $this->get_arrparentid($parentid, $arrparentid); return $arrparentid; } /** * Get the row location of the node * @param $myid node ID number */ public function get_row_location($myid){ $nodearr = $this->arr; // 获取每一个节点所在行的位置 foreach ($nodearr as $key => $node){ if($myid == $node['id']) { $node_row_count = 0; $arrparentid = explode(',', $node['arrparentid']); // 所有父节点小于当前节点层次的底层节点等于0的元素 foreach ($arrparentid as $pid){ foreach ($nodearr as $node_row){ if($node_row['column'] == $nodearr[$pid]['column'] && $nodearr[$pid]['column_level'] > $node_row['column_level'] && $node_row['child_bottom_num'] == 0){ $node_row_count ++; } } } // 所有当前节点并且节点层次（rowid_level）小于当前节点层次的个数 foreach ($nodearr as $node_row){ if($node['column'] == $node_row['column'] && $node_row['column_level'] $node_row_count += $node_row['child_bottom_num'] ? $node_row['child_bottom_num'] : 1; } } $node_row_count++; break; } } return $node_row_count; } /** * Get the number of rows in the table **/ public function get_rows(){ $row = 0; foreach ($this->arr as $key => $node){ if($node['child_bottom_num'] == 0){ $rows++; // 总行数 } } return $rows; } /** * Get the number of columns in the table **/ public function get_columns(){ $columns = 0 ; foreach ($this->arr as $key => $node){ if($node['column'] > $columns){ $columns = $node['column']; // 总列数 } } return $columns; } /** * Get the table display format of the category (excluding headers) **/ public function get_treetable(){ $table_string = ''; for($row = 1; $row rows; $row++){ $table_string .= "rt
{$v['name']}

http://www.bkjia.com/PHPjc/444663.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444663.htmlTechArticleThis article summarizes two PHP infinite classification implementation program codes. Friends who need to learn can refer to it. Main idea: First look at the third and fourth lines. The value of the parent class ID (PARENTID) is...