Php interview questions and answers for beginners-fill in questions and programming questions

Php interview questions and answers for beginners-fill in questions and programming questions

Function my_scandir ($ dir) { $ Files = array (); If ($ handle = opendir ($ dir )){ While ($ file = readdir ($ handle ))! = False ){ If ($ file! = "..." & $ File! = ".") { If (is_dir ($ dir. "/". $ file )){ $ Files [$ file] = scandir ($ dir. "/". $ file ); } Else { $ Files [] = $ file; } } } Closedir ($ handle ); Return $ files; } } 14. briefly describe the implementation principles of unlimited classification in the forum. A: /* The data table structure is as follows: Create table 'Category '( 'Categoryid' smallint (5) unsigned not null auto_increment, 'Categoryparentid' smallint (5) unsigned not null default '0 ′, 'Categoryname' varchar (50) not null default ", Primary key ('categoryid ') ) ENGINE = MyISAM default charset = gbk; Insert into 'category' ('categoryparentid', 'categoryname') VALUES (0, 'level 1 category '), (1, 'level 2 category '), (1, 'level 2 category '), (1, 'level 2 category '), (2, 'third-level category '), (2, '000000 ′), (2, '000000 ′), (3, 'aqqqqqd '), (4, 'Haha '), (5, '000000 ′); */ // Specify the category id variable $ category_id and return all subclasses of the category // $ Default_category is the default selected category. Function Get_Category ($ category_id = 0, $ level = 0, $ default_category = 0) { Global $ DB; $ SQL = "SELECT * FROM category ORDER BY categoryID DESC "; $ Result = $ DB-> query ($ SQL ); While ($ rows = $ DB-> fetch_array ($ result )) { $ Category_array [$ rows [categoryParentID] [$ rows [categoryID] = array ('id' => $ rows [categoryID], 'parent' => $ rows [categoryParentID], 'name' => $ rows [CategoryName]); } If (! Isset ($ category_array [$ category_id]) { Return ""; } Foreach ($ category_array [$ category_id] AS $ key => $ category) { If ($ category ['id'] = $ default_category) { Echo"} Else { Echo"} If ($ level> 0) { Echo ">". str_repeat ("", $ level). "". $ category ['name']. "\ n "; } Else { Echo ">". $ category ['name']. "\ n "; } Get_Category ($ key, $ level + 1, $ default_category ); } Unset ($ category_array [$ category_id]); } /* The array format returned by the function is as follows: Array ( [1] => Array ([id] => 1 [name] => level 1 category [level] => 0 [ParentID] => 0) [4] => Array ([id] => 4 [name] => level 2 category [level] => 1 [ParentID] => 1) [9] => Array ([id] => 9 [name] => haha [level] => 2 [ParentID] => 4) [3] => Array ([id] => 3 [name] => level 2 category [level] => 1 [ParentID] => 1) [8] => Array ([id] => 8 [name] => aqqqqqd [level] => 2 [ParentID] => 3) [2] => Array ([id] => 2 [name] => level 2 category [level] => 1 [ParentID] => 1) [7] => Array ([id] => 7 [name] => 234234 [level] => 2 [ParentID] => 2) [6] => Array ([id] => 6 [name] => 333332 [level] => 2 [ParentID] => 2) [5] => Array ([id] => 5 [name] => level 3 category [level] => 2 [ParentID] => 2) [10] => Array ([id] => 10 [name] => 66333666 [level] => 3 [ParentID] => 5) ) */ // Specify the Category id and return the array Function Category_array ($ category_id = 0, $ level = 0) { Global $ DB; $ SQL = "SELECT * FROM category ORDER BY categoryID DESC "; $ Result = $ DB-> query ($ SQL ); While ($ rows = $ DB-> fetch_array ($ result )) { $ Category_array [$ rows ['categoryparentid'] [$ rows ['categoryid'] = $ rows; } Foreach ($ category_array AS $ key => $ val) { If ($ key = $ category_id) { Foreach ($ val AS $ k => $ v) { $ Options [$ k] = Array ( 'Id' => $ v ['categoryid'], 'name' => $ v ['categoryname'], 'level' => $ level, 'parentid' => $ v ['categoryparentid'] ); $ Children = Category_array ($ k, $ level + 1 ); If (count ($ children)> 0) { $ Options = $ options + $ children; } } } } Unset ($ category_array [$ category_id]); Return $ options; } ?> Class cate { Function Get_Category ($ category_id = 0, $ level = 0, $ default_category = 0) { Echo $ category_id; $ Arr = array ( '0' => array ( '1' => array ('id' => 1, 'parent' => 0, 'name' => '123 ′), '2' => array ('id' => 2, 'parent' => 0, 'name' => '123 ′), '4' => array ('id' => 4, 'parent' => 0, 'name' => '123 ′) ), '1' => array ( '3' => array ('id' => 3, 'parent' => 1, 'name' => '123 ′), '5' => array ('id' => 5, 'parent' => 1, 'name' => '123 ′) ), '3' => array ( '6' => array ('id' => 6, 'parent' => 3, 'name' => '123 ′), '7' => array ('id' => 7, 'parent' => 3, 'name' => '123 ′) ), '4' => array ( '8' => array ('id' => 8, 'parent' => 4, 'name' => '123 ′), '9' => array ('id' => 9, 'parent' => 4, 'name' => '123 ′) ) ); If (! Isset ($ arr [$ category_id]) { Return ""; } Foreach ($ arr [$ category_id] AS $ key => $ cate) { If ($ cate ['id'] = $ default_category) { $ Txt ="} Else { $ Txt ="} If ($ level> 0) { $ Txt1 = ">". str_repeat ("-", $ level). "". $ cate ['name']. "\ n "; } Else { $ Txt1 = ">". $ cate ['name']. "\ n "; } $ Val = $ txt. $ txt1; Echo $ val; Self: Get_Category ($ key, $ level + 1, $ default_category ); } } Function getFlush ($ category_id = 0, $ level = 0, $ default_category = 0) { Ob_start (); Self: Get_Category ($ category_id, $ level, $ default_category ); $ Out = ob_get_contents (); Ob_end_clean (); Return $ out; } } $ Id = $ _ GET ['id']; Echo ""; $ C = new cate (); // $ C-> Get_Category (); $ Ttt = $ c-> getFlush ($ id, '0', '3 ′); Echo $ ttt; Echo ""; ?>