Php unlimited classification, super simple unlimited classification, support output tree chart _ php skills

Php unlimited classification, super simple unlimited classification, support output tree chart, code from the network, but I have used it for a long time to share it with you without platform restrictions
You only need to inform the id, parentid, and name.

<? Phperror_reporting (E_ALL ^ E_NOTICE ); class Tree {/** + dimensions * The two-dimensional Array + dimensions * @ author abc + ---------------------------------------------------------- * @ var array */var $ arr = Array () required for generating the Tree structure (); /** + ------------------------------------------------ * the modifier required to generate the tree structure. you can change it to an image + -------------------------------------- * @ au Thor abc + -------------------------------------------- * @ var Array */var $ icon = array ('│ ', 'hangzhou', 'hangzhou '); /*** @ access private */var $ ret = '';/*** constructor, initialization class * @ param array 2-dimensional array, for example: * array (* 1 => array ('id' => '1', 'parentid' => 0, 'name' => 'Level 1 topic 1 '), * 2 => array ('id' => '2', 'parentid' => 0, 'name' => 'Level 1 column 2 '), * 3 => array ('id' => '3', 'parentid' => 1, 'name' => 'second-level column 1 '), * 4 => array ('id' => '4', 'parentid' => 1, 'Name' => 'second-level column 2'), * 5 => array ('id' => '5', 'parentid' => 2, 'name' => 'column 3 '), * 6 => array ('id' => '6', 'parentid' => 3, 'name' => 'Level 3 topic 1'), * 7 => array ('id' => '7', 'parentid' => 3, 'name' => 'third-level column 2') */function tree ($ arr = array () {$ this-> arr = $ arr; $ this-> ret = ''; return is_array ($ arr );} /*** get the parent array * @ param int * @ return array */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 sublevel array * @ param int * @ return array */function get_child ($ myid) {$ a = $ newarr = array (); if (is_array ($ this-> arr) {foreach ($ this-> arr as $ id => $) {If ($ a ['parentid'] ==$ myid) $ newarr [$ id] = $ a ;}} return $ newarr? $ Newarr: false;}/*** get the current position array * @ param int * @ return array */function get_pos ($ myid, & $ newarr) {$ a = array (); if (! Isset ($ this-> arr [$ myid]) return false; $ newarr [] = $ this-> arr [$ myid]; $ pid = $ this-> arr [$ myid] ['parentid']; if (isset ($ this-> arr [$ pid]) {$ this-> get_pos ($ pid, $ newarr);} if (is_array ($ newarr) {krsort ($ newarr); foreach ($ newarr as $ v) {$ a [$ v ['id'] = $ v ;}} return $ ;} /***** obtain the tree structure ** --------------------------------------------- * @ author abc * @ param $ myid indicates that all sub-levels under this ID are obtained * @ param $ str generates the basic code of the tree structure, example :"\ $ Spacer \ $ name"* @ Param $ ID the selected ID. for example, you need to use * @ param $ adds * @ param $ str_group */function get_tree ($ myid, $ str, $ sid = 0, $ adds = '', $ str_group ='') {$ number = 1; $ child = $ this-> get_child ($ myid ); if (is_array ($ child) {$ total = count ($ child); foreach ($ child as $ id => $ a) {$ j = $ k = ''; if ($ number = $ total) {$ j. = $ this-> icon [2];} else {$ j. = $ this-> icon [1]; $ k = $ adds? $ This-> icon [0]: '';} $ spacer = $ adds? $ Adds. $ j: ''; $ selected = $ id = $ sid? 'Selected': ''; @ extract ($ a); $ parentid = 0 & $ str_group? Eval ("\ $ nstr = \" $ str_group \ ";"): eval ("\ $ nstr = \" $ str \ ";"); $ this-> ret. = $ nstr; $ this-> get_tree ($ id, $ str, $ sid, $ adds. $ k. '', $ str_group); $ number ++;} return $ this-> ret;}/*** similar to the previous method, however, you can select */function get_tree_multi ($ myid, $ str, $ sid = 0, $ adds = '') {$ number = 1; $ child = $ this-> get_child ($ myid); if (is_array ($ child) {$ total = count ($ child ); foreach ($ child as $ id => $ a) {$ j = $ k = ''; if ($ nu Mber = $ total) {$ j. = $ this-> icon [2];} else {$ j. = $ this-> icon [1]; $ k = $ adds? $ This-> icon [0]: '';} $ spacer = $ adds? $ Adds. $ j: ''; $ selected = $ this-> have ($ sid, $ id )? 'Selected': ''; @ extract ($ a); eval (" \ $ nstr = \ "$ str \"; "); $ this-> ret. = $ nstr; $ this-> get_tree_multi ($ id, $ str, $ sid, $ adds. $ k. ''); $ number ++;} return $ this-> ret;} function have ($ list, $ item) {return (strpos (',,'. $ list. ',',','. $ item. ',');}/** + -------------------------------------------------- * format the array + response * @ author abc + --------------------------- --------------------- */Function getArray ($ myid = 0, $ sid = 0, $ adds = '') {$ number = 1; $ child = $ this-> get_child ($ myid); if (is_array ($ child) {$ total = count ($ child ); foreach ($ child as $ id => $ a) {$ j = $ k = ''; if ($ number = $ total) {$ j. = $ this-> icon [2];} else {$ j. = $ this-> icon [1]; $ k = $ adds? $ This-> icon [0]: '';} $ spacer = $ adds? $ Adds. $ j: ''; @ extract ($ a); $ a ['name'] = $ spacer. ''. $ a ['name']; $ this-> ret [$ a ['id'] = $ a; $ fd = $ adds. $ k. ''; $ this-> getArray ($ id, $ sid, $ fd); $ number ++;} return $ this-> ret ;}} $ data = array (1 => array ('id' => '1', 'parentid' => 0, 'name' => 'Level 1 topic 1 '), 2 => array ('id' => '2', 'parentid' => 0, 'name' => 'Level 1 column 2 '), 3 => array ('id' => '3', 'parentid' => 1, 'name' => 'second-level topic 1 '), 4 => array ('id' => '4', 'parentid' => 1, 'name' => 'second-level column 2 '), 5 => array ('id' => '5', 'parentid' => 2, 'name' => 'second-level column 3 '), 6 => array ('id' => '6', 'parentid' => 3, 'name' => 'Level 3 topic 1 '), 7 => array ('id' => '7', 'parentid' => 3, 'name' => ''), 8 => array ('id' => '8', 'parentid' => 3, 'name' => 'third-level column 3 '), 9 => array ('id' => '9', 'parentid' => 7, 'name' => 'level 4 category 3 '),); $ tree = new Tree; $ tree-> tree ($ data); // If arrays are used, use the getArray method // $ tree-> getArray (); // use the get_tree method for the drop-down menu options $ html =''; $ Str ="\ $ Spacer \ $ name"; $ Html. = $ tree-> get_tree (0, $ str,-1 ).''; Echo $ html;?>