Unlimited categories_PHP tutorial

Unlimited categories

//Infinite classification, the main idea is this, use fid to record the upper-level ID of the class, and establish a superior-subordinate relationship through fid and id.

$conn = mysql_connect("localhost","root","root") or die("Database connection lost");
mysql_select_db("new",$conn);
?>
Category:
function mainfl()
{
global $conn;
$result=mysql_query("select id,fid,name from a where fid=0 order by id ",$conn);//The default fid=0 here means that this is the first level. Through this, all items with fid=0 can be found, that is, all first-level main categories
if ($myrow=mysql_fetch_array($result))
{
do {
?>
>//$myrow[" id"] Output the ID of the main class to prepare for querying subclasses, $myrwo["name"]The name of the main class
//To call the subclass function subfl, use --

http://www.bkjia.com/PHPjc/631899.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/631899.htmlTechArticleUnlimited Classification //Infinite classification, the main idea is this, use fid to record the upper-level ID of the class , establish a superior-subordinate relationship through fid and id. ?php $conn = mysql_connect(localhost,root...

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