PHP 实现无限极栏目分类

首先，创建一个DB

CREATE TABLE IF NOT EXISTS `class` ( 
  `id` mediumint(6) NOT NULL AUTO_INCREMENT, 
  `title` varchar(30) NOT NULL, 
  `pid` mediumint(6) NOT NULL DEFAULT '0', 
  PRIMARY KEY (`id`) 
) ENGINE=MyISAM  DEFAULT CHARSET=utf8

然后插入数据

INSERT INTO `class` VALUES (1, '品牌女装', 0);
INSERT INTO `class` VALUES (2, '精品男装', 0);
INSERT INTO `class` VALUES (3, '连衣裙', 1);
INSERT INTO `class` VALUES (4, '旗袍', 1);
INSERT INTO `class` VALUES (5, '燕尾服', 2);

 数据的结构能够自己去设计

这里采用递归的方法去实现无限极栏目分类

<?php 

$con = mysql_connect("localhost","root","123456");

mysql_query("set names 'utf8'");
mysql_select_db("test");

function get_str($id = 0) { 
    global $str; 
    $sql = "select id,title from class where pid= $id";  
    $result = mysql_query($sql);
    if($result && mysql_affected_rows()){
        $str .= '<ul>'; 
        while ($row = mysql_fetch_array($result)) { 
            $str .= "<li>" . $row['id'] . "--" . $row['title'] . "</li>"; 
            get_str($row['id']); 
        } 
        $str .= '</ul>'; 
    } 
    return $str; 
} 

echo get_str(0); 


?>

 返回一个数组

<?php 

$con = mysql_connect("localhost","root","123456");

mysql_query("set names 'utf8'");
mysql_select_db("test");

function get_array($id=0){ 
    $sql = "select id,title from class where pid= $id"; 
    $result = mysql_query($sql);
    $arr = array(); 
    if($result && mysql_affected_rows()){ 
        while($rows=mysql_fetch_assoc($result)){ 
            $rows['list'] = get_array($rows['id']); 
            $arr[] = $rows; 
        } 
        return $arr; 
    } 
}
$list = get_array(0); 
var_dump($list);?>

 第三种分类；将同一个字段的一样的值归为一类，

 function Staff_Pay_nen($type,$emp_cd){
	$con=dbcon9();
	$sql = " "; 
	$sql .= " SELECT "; 
	$sql .= " pay_nen "; 
	if($type == "haken"){
		//派遣
		$sql .= " FROM "; 
		$sql .= " tbl_staff_gensen "; 
		$sql .= " WHERE "; 
		$sql .= " staff_cd = '".$emp_cd."' AND "; 
		$sql .= " kokyaku_cd= '000000' AND "; 
		$sql .= " sagyo_type='0' AND "; 
	}elseif($type == "syoukai"){
		//日々紹介
		$sql .= " ,kokyaku_cd ";
		$sql .= " FROM "; 
		$sql .= " tbl_staff_gensen ";  
		$sql .= " WHERE ";	
		$sql .= " staff_cd = '".$emp_cd."' AND "; 	 
		$sql .= " sagyo_type ='1' AND "; 
		$sql .= " kokyaku_cd <> '000000' AND "; 
		$sql .= " pay_nen is not null AND ";	
	}	
	if(1 <= date("n",time()) && date("n",time()) <=6){
			//処理日前年と処理日当年	
			$sql .= "  pay_nen in (to_char(now(),'yyyy'),to_char(now() + '-1 year','yyyy')) "; 	
	}else if(7 <= date("n",time()) && date("n",time()) <=12){
			//処理日当年のみ
			$sql .= "  pay_nen in (to_char(now(),'yyyy')) "; 
	}		
	$sql .= " ORDER BY "; 
	$sql .= " pay_nen desc ";
	$sql .= " ,kokyaku_cd ASC ";
	$result=pg_query($sql);
	$i = 0;
	$test_day = "";
	$pay_nen = array();
	if($type == "haken"){
		//派遣
		while($row=pg_fetch_assoc($result)){
			$pay_nen[$i] = $row['pay_nen'];	
			$i++;
		}
	}elseif($type == "syoukai"){
		//日々紹介
		while($row=pg_fetch_assoc($result)){
			if($test_day == $row['pay_nen']){
				$pay_nen[$row['pay_nen']] .= ",".$row['kokyaku_cd'];
			}else{
				$pay_nen[$row['pay_nen']] = $row['kokyaku_cd'];
			}						
			$test_day = $row['pay_nen'];
		}
	}
	return $pay_nen;
 }

 这样的显示如下

品牌女装
    连衣裙
    旗袍
精品男装
    燕尾服