php将数组变量保存到文件

$arr=array (
'1' => array ( 'date' => '2011-08-18', 'num' => 5 ) ,
'2' => array ( 'date' => '2011-08-20', 'num' => 3 ) ,
'3' => array ( 'date' => '2011-08-17', 'num' => 10 )
 )  ; $result = sysSortArray($arr,'num');这样运行之后的效果为：

$arr=array (
'1' => array ( 'date' => '2011-08-18', 'num' => 3 ) ,
'2' => array ( 'date' => '2011-08-20', 'num' => 5 ) ,
'3' => array ( 'date' => '2011-08-17', 'num' => 10 )
 )  ;用到的函数：

/**
 * @package     二维数组排序
 * @version     $Id: FunctionsMain.inc.php,v 1.32 2011/09/24 11:38:37 wwccss Exp $
 *
 *
 * Sort an two-dimension array by some level two items use array_multisort() function.
 *
 * sysSortArray($Array,"Key1","SORT_ASC","SORT_RETULAR","Key2";……)
 * @author                      lamp100
 * @param  array   $ArrayData   the array to sort.
 * @param  string  $KeyName1    the first item to sort by.
 * @param  string  $SortOrder1  the order to sort by("SORT_ASC"|"SORT_DESC")
 * @param  string  $SortType1   the sort type("SORT_REGULAR"|"SORT_NUMERIC"|"SORT_STRING")
 * @return array                sorted array.
 */
function sysSortArray($ArrayData,$KeyName1,$SortOrder1 = "SORT_ASC",$SortType1 = "SORT_REGULAR")
{
    if(!is_array($ArrayData))
    {
        return $ArrayData;
    }

    // Get args number.
    $ArgCount = func_num_args();

    // Get keys to sort by and put them to SortRule array.
    for($I = 1;$I < $ArgCount;$I ++)
    {
        $Arg = func_get_arg($I);
        if(!eregi("SORT",$Arg))
        {
            $KeyNameList[] = $Arg;
            $SortRule[]    = '$'.$Arg;
        }
        else
        {
            $SortRule[]    = $Arg;
        }
    }

    // Get the values according to the keys and put them to array.
    foreach($ArrayData AS $Key => $Info)
    {
        foreach($KeyNameList AS $KeyName)
        {
            ${$KeyName}[$Key] = $Info[$KeyName];
        }
    }

    // Create the eval string and eval it.
    $EvalString = 'array_multisort('.join(",",$SortRule).',$ArrayData);';
    eval ($EvalString);
    return $ArrayData;
}

<?php
 
 $arr = '';
 
 echo '二维数组如下：'.'<br / >';
 for($i=0; $i<=5; $i++)
 {
  $arr[$i]['val'] = mt_rand(1, 100);
  $arr[$i]['num'] = mt_rand(1, 100);
 }
 
 echo '<pre>';
 print_r($arr);
 echo '</pre>';
 
 echo '从二维数组中抽出键为val，单独成另一个数组：'.'<br / >';
 foreach ($arr as $key => $row)
 {
     $vals[$key] = $row['val'];
        $nums[$key] = $row['num'];
 }
 
 echo '<pre>';
 print_r($vals);
 echo '</pre>';
 
 echo '对其进行排序：'.'<br / >';
 array_multisort($vals, SORT_ASC, $arr);
 
 echo '<pre>';
 print_r($vals);
 echo '</pre>';
 
?>

 <?php
/**
* 文件描述 Session类
* =================================================================
* 文件名称 session.class.php
* -----------------------------------------------------------------
* 适用环境： PHP5.2.x / mysql 5.0.x
* -----------------------------------------------------------------
* 作 者 04ie。com
* -----------------------------------------------------------------
* 创建时间 2010-2-1
* =================================================================
*/
class Session
{
/**
* session默认有效时间
* @access public
* @var ineger $_expiry
*/
public $_expiry = 3600;
/**
* 有效域名
* @access public
* @var string $_domain
*/
public $_domain = '.phpfamily.cn';
//初始化
public function __construct()
{
ini_set('session.use_trans_id', 0);
ini_set('session.gc_maxlifetime', $this->_expiry);
ini_set('session.use_cookie', 1);
ini_set('session.cookie_path', '/');
ini_set('session.cookie_domain', $this->_domain);
session_module_name('user');
session_set_save_handler(
array(&$this, 'open'),
array(&$this, 'close'),
array(&$this, 'read'),
array(&$this, 'write'),
array(&$this, 'destroy'),
array(&$this, 'gc')
);
session_start();
}
/**
* 打开session
* @access public
* @param string $savePath
* @param string $sName
* @return true
*/
public function open($savePath, $sName)
{
$this->_conn = mysql_connect('localhost', 'root', '');
mysql_select_db('databases');
mysql_query('SET NAMES "utf8"');
return true;
}
/**
* 关闭session
* @access public
* @return bool
*/
public function close()
{
return mysql_close($this->_conn);
}
/**
* 读取session
* @access public
* @param string $sid sessionID
* @return mixed
*/
public function read($sid)
{
$sql = "SELECT data FROM sessions WHERE sessionid='%s'";
$sql = sprintf($sql, $sid);
$res = mysql_query($sql, $this->_conn);
$row = mysql_fetch_assoc($res);
return !$row ? null : $row['data'];
}
/**
* 写入session
* @access public
* @param string $sid sessionID
* @param string $data serialize序列化后的session内容
* @return
*/
public function write($sid, $data)
{
$expiry = time() + $this->_expiry;
$sql = "REPLACE INTO sessions (sessionid,expiratio
n,data) VALUES ('%s', '%d', '%s')";
$sql = sprintf($sql, $sid, $expiry, $data);
mysql_query($sql, $this->_conn);
return true;
}
/**
* 销毁session
* @access public
* @param string $sid sessionID
* @return
*/
public function destroy($sid)
{
$sql = "DELETE FROM sessions WHERE sessionid='%s'";
$sql = sprintf($sql, $sid);
mysql_query($sql, $this->_conn);
return true;
}
/**
* 清理过期session
* @access public
* @param integer $time
* @return
*/
public function gc($time = 0)
{
$sql = "DELETE FROM sessions WHERE expiration < '%d'";
$sql = sprintf($sql, time());
mysql_query($sql, $this->_conn);
mysql_query('OPTIMIZE TABLE sessions');
return true;
}
 

<?php
class Cart{
 public function Cart() {
  if(!isset($_SESSION['cart'])){
   $_SESSION['cart'] = array();
  }
 }

 /*
 添加商品
 param int $id 商品主键
    string $name 商品名称
    float $price 商品价格
    int $num 购物数量
 */
 public  function addItem($id,$name,$price,$num,$img) {
  //如果该商品已存在则直接加其数量
  if (isset($_SESSION['cart'][$id])) {
   $this->incNum($id,$num);
   return;
  }
  $item = array();
  $item['id'] = $id;
  $item['name'] = $name;
  $item['price'] = $price;
  $item['num'] = $num;
  $item['img'] = $img;
  $_SESSION['cart'][$id] = $item;
 }

 /*
 修改购物车中的商品数量
 int $id 商品主键
 int $num 某商品修改后的数量，即直接把某商品
 的数量改为$num
 */
 public function modNum($id,$num=1) {
  if (!isset($_SESSION['cart'][$id])) {
   return false;
  }
  $_SESSION['cart'][$id]['num'] = $num;
 }

 /*
 商品数量+1
 */
 public function incNum($id,$num=1) {
  if (isset($_SESSION['cart'][$id])) {
   $_SESSION['cart'][$id]['num'] += $num;
  }
 }

 /*
 商品数量-1
 */
 public function decNum($id,$num=1) {
  if (isset($_SESSION['cart'][$id])) {
   $_SESSION['cart'][$id]['num'] -= $num;
  }

  //如果减少后，数量为0，则把这个商品删掉
  if ($_SESSION['cart'][$id]['num'] <1) {
   $this->delItem($id);
  }
 }

 /*
 删除商品
 */
 public function delItem($id) {
  unset($_SESSION['cart'][$id]);
 }
 
 /*
 获取单个商品
 */
 public function getItem($id) {
  return $_SESSION['cart'][$id];
 }

 /*
 查询购物车中商品的种类
 */
 public function getCnt() {
  return count($_SESSION['cart']);
 }
 
 /*
 查询购物车中商品的个数
 */
 public function getNum(){
  if ($this->getCnt() == 0) {
   //种数为0，个数也为0
   return 0;
  }

  $sum = 0;
  $data = $_SESSION['cart'];
  foreach ($data as $item) {
   $sum += $item['num'];
  }
  return $sum;
 }

 /*
 购物车中商品的总金额
 */
 public function getPrice() {
  //数量为0，价钱为0
  if ($this->getCnt() == 0) {
   return 0;
  }
  $price = 0.00;
  foreach ($this->items as $item) {
   $price += $item['num'] * $item['price'];
  }
  return sprintf("%01.2f", $price);
 }

 /*
 清空购物车
 */
 public function clear() {
  $_SESSION['cart'] = array();
 }
}