PHP uses recursive method to implement infinite class classification code

$dbhost = "localhost"; Database host Name $dbuser = "root"; Database user Name $DBPD = "123456"; Database Password $dbname = "Test"; Database name Mysql_connect ($dbhost, $dbuser, $DBPD); Connecting the host mysql_select_db ($dbname); Select Database 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)) { Indent Display node name echo $tag. $row [' classname ']. " "; Call this function again to show child nodes of child nodes Display_tree ($tag. " ─┴ ", $row [' id ']); } } ?> Copy Code Note : The use of recursive method, for a large number of sub-column efficiency will be low, some mature CMS system, are used in the production of an array of methods called to improve efficiency.

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