php无极分类

/*
CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `pid` int(11) NOT NULL DEFAULT ‘0‘,
  `cname` varchar(30) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
**/
mysql_connect(‘localhost‘, ‘root‘, ‘‘) or die(‘Cannot connected to mysql server‘);
mysql_select_db(‘security‘);
mysql_query(‘set names utf8‘);

$sql = ‘select * from category‘;
$rs  = mysql_query($sql);

$categories = array();
while ($row = mysql_fetch_assoc($rs)) {
	$categories[] = $row;
}

//$arr = get_comment($categories);
//echo get_tree($arr);

echo ‘<select>‘;
treew($categories);
echo ‘</select>‘;

function treew($arr, $pid = 0, $n = 0){
	$s = str_pad(‘‘,$n,‘-‘); 
	$s = str_replace(‘-‘, ‘  ‘, $s);

	for ($i=0; $i < count($arr); $i++) { 
		if ($pid == $arr[$i][‘pid‘]) {
			echo ‘<option>‘ . $s .$arr[$i][‘cname‘]. "</option>\n"; 
			treew($arr, $arr[$i][‘id‘], $n+1); 
		}
	}
}

function get_comment($categories, $pid = 0) {
	$array = array();
	foreach ($categories as $key => $value) {
		if ($pid == $value[‘pid‘]) {
			$value[‘son‘] = get_comment($categories, $value[‘id‘]);
			$array[] = $value;
		}
	}

	return $array;
}

function get_tree($arr) {
	$html = ‘‘;
	foreach ($arr as $key => $value) {
		if (empty($value[‘son‘])) {
			$html .= $value[‘cname‘] . ‘<br/>‘;
		} else {
			$html .= $value[‘cname‘] . get_tree($value[‘son‘]) . ‘<br/>‘;
		}
	}
	return $html;
	
}