系统通用函数类

整理了一些常用自定义函数

<?php
/**
 * --------------------------------------------------------------------------
 * 系统通用函数类
 * 
 * --------------------------------------------------------------------------
 */

class General
{
	
	/**
	 * 验证邮箱
	 *
	 * @static 
	 * @access public
	 * @param string	$email	邮箱
	 * @return int
	 */
	public static function validateEmail($email)
	{
		$pattern = "/^[0-9a-z]+(?:[\_\-\.][a-z0-9\-]+)*@[a-z0-9]+(?:[-.][a-z0-9]+)*\.[a-z]+$/i";
		return preg_match($pattern, $email);
	}
	
	
	/**
	 * 将密码加密
	 *
	 * @static 
	 * @access public
	 * @param string	$password	要加密的密码原文
	 * @return string
	 */
	public static function encryptPassword($password)
	{
		$string = '';
		for ($i=0; $i<10; $i++) {
			$string .= self::rand();
		}
		
		$salt = substr(md5($string), 0, 5);
		
		$password = md5($salt . $password) . ':' . $salt;
		
		return $password;
	}
	
	
	/**
	 * 对密码进行验证
	 *
	 * @static 
	 * @access public
	 * @param string	$password	密码原文
	 * @param string	$encrypted	加密后的密码
	 * @return string
	 */
	public static function validatePassword($password, $encrypted)
	{
		if (!empty($password) && !empty($encrypted)){
			$arr = explode(':', $encrypted);
			if (count($arr) != 2){
				return false;
			}
			if (md5($arr[1].$password) == $arr[0]){
				return true;
			}
		}
		return false;
	}
	
	
	/**
	 * 产生随机数
	 *
	 * @static 
	 * @access public
	 * @param int	$min	随机数最小值范围
	 * @param int	$max	随机数最大值范围
	 * @return string
	 */
	public static function rand($min = null, $max = null)
	{
		static $seed;
		if (!isset($seed)){
			mt_srand((double)microtime()*1000000);
			$seeded = true;
		}
		
		if (isset($min) && isset($max)){
			if ($min >= $max){
				return $min;
			}else{
				return mt_rand($min, $max);
			}
		}else{
			return mt_rand();
		}
	}
	
	
	/**
	 * @desc 创建随机密码
	 * @static 
	 * @access public
	 * @return string
	 */
	public static function randPassword(){
		$salt = "46z3haZzegmn676PA3rUw2vrkhcLEn2p1c6gf7vp2ny4u3qqfqBh5j6kDhuLmyv9xf";
		//srand((double)microtime()*1000000); 自PHP 4.2.0 起，不再需要用srand()给随机数发生器播种现在是由系统自动完成的
		$password = '';
		for ($x = 0; $x < 7; $x++) {
			$num = rand() % 33;
			$tmp = substr($salt, $num, 1);
			$password = $password . $tmp;
		}
		return $password;
	}
	
	
	/**
	 * 获取访问者的IP地址
	 *
	 * @access stat
	 * @var resource
	 */
	public static function IP()
	{
		if (isset($_SERVER)) {
			if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
				$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
			} elseif (isset($_SERVER['HTTP_CLIENT_IP'])) {
				$ip = $_SERVER['HTTP_CLIENT_IP'];
			} else {
				$ip = $_SERVER['REMOTE_ADDR'];
			}
		} else {
			if (getenv('HTTP_X_FORWARDED_FOR')) {
				$ip = getenv('HTTP_X_FORWARDED_FOR');
			} elseif (getenv('HTTP_CLIENT_IP')) {
				$ip = getenv('HTTP_CLIENT_IP');
			} else {
				$ip = getenv('REMOTE_ADDR');
			}
		}
		
		return $ip;
	}
	
	
	/**
	 * 判断是否为手机浏览
	 *
	 * @access static
	 * @return bool
	 */
	public static function isMobile(){
		// 如果有HTTP_X_WAP_PROFILE则一定是移动设备
		if (isset ($_SERVER['HTTP_X_WAP_PROFILE'])) {
			return true;
		}
		
		//如果via信息含有wap则一定是移动设备,部分服务商会屏蔽该信息
		if (isset ($_SERVER['HTTP_VIA'])) {
			//找不到为flase,否则为true
			return stristr($_SERVER['HTTP_VIA'], "wap") ? true : false;
		}
		
		if (isset($_SERVER['HTTP_USER_AGENT'])){
			$keywords = array(
				'nokia', 'sony', 'ericsson', 'mot', 'samsung', 'htc', 'sgh',
				'lg', 'sharp', 'sie-', 'philips', 'panasonic', 'alcatel', 'lenovo',
				'iphone', 'ipod', 'blackberry', 'meizu', 'android', 'netfront', 'symbian',
				'ucweb', 'windowsce', 'palm', 'operamini', 'operamobi', 'openwave', 'nexusone',
				'cldc', 'midp', 'wap', 'mobile', 
			);
			if (preg_match("/(" . implode('|', $keywords) . ")/i", strtolower($_SERVER['HTTP_USER_AGENT']))){
				return true;
			}
		}
		
		if (isset ($_SERVER['HTTP_ACCEPT'])) {
			if ((strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') !== false) 
				&& (
					strpos($_SERVER['HTTP_ACCEPT'], 'text/html') === false 
					|| (strpos($_SERVER['HTTP_ACCEPT'], 'vnd.wap.wml') < strpos($_SERVER['HTTP_ACCEPT'], 'text/html'))
					)
			){
				return true;
			}
		}
		
		return false;
	}
	
	/**
	 * @desc Return a products_id from a product ID with attributes
	 * @param string $uprid 格式:23689{28}365
	 */ 
	public static function getPidFromCombineId($uprid) {
		$pieces = explode('{', $uprid);
	
		if (is_numeric($pieces[0])) {
			return $pieces[0];
		} else {
			return false;
		}
	}
	
	/**
	 * 创建SQL IN 子句
	 *
	 * @param	array	$item_list	ID组
	 * @param	string	$field_name	字段名称
     * @param bool $is_int 是否是整形的数组，如果是 则不使用单引号处理数据项
	 * @return	string
	 */
	public static function createSqlIn($item_list, $field_name = '',$is_int=false)
	{
		if (empty($item_list))
		{
			return $field_name . " IN ('') ";
		}
		else
		{
			if (!is_array($item_list))
			{
				$item_list = explode(',', $item_list);
			}
			$item_list = array_unique($item_list);
			$item_list_tmp = '';
			foreach ($item_list AS $item)
			{
				if ($item !== '')
				{
                    if($is_int == true)
                    {
                        $item_list_tmp .= $item_list_tmp ? ",$item" : "$item";
                    }
                    else
                    {
                        $item_list_tmp .= $item_list_tmp ? ",'$item'" : "'$item'";
                    }
				}
			}
			if (empty($item_list_tmp))
			{
				return $field_name . " IN ('') ";
			}
			else
			{
				return $field_name . ' IN (' . $item_list_tmp . ') ';
			}
		}
	}
	

	/**
	 * @desc 判断$value是否为null
	 * @param $value
	 * @return bool true:not null,false:null
	 */
	public static function isNotNull($value) {
		if (is_array($value)) {
			if (count($value) > 0) {
				return true;
			}
			else {
				return false;
			}
		}
		else {
			if (($value != '') && (strtolower($value) != 'null') && (strlen(trim($value)) > 0)) {
				return true;
			}
			else {
				return false;
			}
		}
	}
	
	/**
	 * @desc 根据指定精度进行四舍五入
	 * @param number $number 金额/其他数值
	 * @param int $precision 精度
	 * @return number 四舍五入后结果
	 */
	public static function roundByPrecision($number, $precision)
	{
		if (strpos($number, '.') && (strlen(substr($number, strpos($number, '.')+1)) > $precision))
		{
			$number = substr($number, 0, strpos($number, '.') + 1 + $precision + 1);
			if (substr($number, -1) >= 5)
			 {
				if ($precision > 1)
				{
					$number = substr($number, 0, -1) + ('0.' . str_repeat(0, $precision-1) . '1');
				}
				elseif ($precision == 1)
				{
					$number = substr($number, 0, -1) + 0.1;
				}
				else
				{
					$number = substr($number, 0, -1) + 1;
				}
			}
			else
			{
				$number = substr($number, 0, -1);
			}
		}
		return $number;
	}
	
	/**
	 * @desc html实体转换为html字符
	 * @return string 格式化后的字符串
	 */
	public static function decodeSpecialchars($string){
		$string=str_replace('&gt;', '>', $string);
		$string=str_replace('&lt;', '<', $string);
		$string=str_replace('&#039;', "'", $string);
		$string=str_replace('&quot;', "\"", $string);
		$string=str_replace('&amp;', '&', $string);
	
		return $string;
	}
	
	
	/**
	 * 把xml对象转换成数组 
	 * 
	 * @static 
	 * @param object $xmlObj
	 * @return array
	 */
	public static function xmlObjToArray($xmlObj){
		$result = array();
		if (is_object($xmlObj)){
			$arr = get_object_vars($xmlObj);
			if ($arr){
				foreach ($arr as $k => $v){
					if (is_object($v)){
						$result[$k] = self::xmlObjToArray($v);
					}
					elseif (is_array($v)){
						foreach ($v as $vk => $vv){
							$v[$vk] = self::xmlObjToArray($vv);
						}
						$result[$k] = $v;
					}else{
						$result[$k] = $v;
					}
				}
			}else{
				return '';
			}
			
		}
		else
		{
			return $xmlObj;
		}
		return $result;
	}
	
	
	
	/**
	 * 获取当前日期
	 * 
	 * @static 
	 * @param bool	 $is_china 	是否获取中国日期
	 * @param string $format 	日期格式
	 * @param bool	 $is_time	是否返回时间戳
	 * @param int	 $time		可设置具体时间点
	 * @return string
	 */
	public static function nowDate($is_china = false, $format = 'Y-m-d H:i:s', $is_time = false, $time = null){
		if ($is_china){
			$default_zone = date_default_timezone_get();
			$china_zone = 'Etc/GMT-8';
			date_default_timezone_set($china_zone);
		}
		$time = intval($time);
		$format = $format ? $format : 'Y-m-d H:i:s';
		$date = $time > 0 ? date($format, $time) : date($format);
		$date = $is_time ? strtotime($date) : $date;
		
		if ($is_china){
			date_default_timezone_set($default_zone);
		}
		
		return $date;
	}
	
	
	/**
	 * 把中国日期转换成服务器日期
	 * 
	 * @static 
	 * @param bool	 $china 	中国日期
	 * @param string $format 	日期格式
	 * @param bool	 $is_time	是否返回时间戳
	 * @return string
	 */
	public static function china2ServerDate($china_date, $format = 'Y-m-d H:i:s', $is_time = false){
		//保存服务器时区
		$default_zone = date_default_timezone_get();
		
		//设置中国时区
		$china_zone = 'Etc/GMT-8';
		date_default_timezone_set($china_zone);
		//按中国时区转换成时间戳
		$time = strtotime($china_date);
		//还原服务器时区
		date_default_timezone_set($default_zone);
		
		if ($is_time){
			return $time;
		}
		
		$format = $format ? $format : 'Y-m-d H:i:s';
		$date = date($format, $time);
		
		return $date;
	}
	
	
	
	
	
	/**
	 * 简单模拟多线程请求
	 * 
	 * @static 
	 * @access public
	 * @param string $url_path	请求程序脚本地址
	 * @param string $host		请求域名
	 * @param int	 $port		请求端口号
	 * @param int	 $time		超时时间
	 * @return void
	 */
	public static function asynReuquest($url_path, $host, $port = 80, $time = 5){
		$fp = @fsockopen($host, $port, &$errno, &$errstr, $time);
		if (!$fp){
			ZERROR::raiseWarning(404, 'Can not connect asyn host');
		}
		@fputs($fp, "GET $url_path\r\n");
		@fclose($fp);
	}

	
    /**
     * @desc 判断是否是异步请求
     * @static
     * @return bool
     */
    public static function isAjaxRequest()
    {
        $isAjax = isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] ==='XMLHttpRequest' ? true : false;

        return $isAjax;
    }
    
    
    /**
     * @desc 发送系统邮件
     * @static
     * @access public
     * @param string $toName	收件人名称
     * @param string $toEmail	收件人邮箱
     * @param string $subject	邮件标题
     * @param string $body		邮件内容
     * @param string $fromName	发件人名称
     * @param string $fromEmail	发件人邮箱
     * @return mixed
     */
    public static function sendMail($toName, $toEmail, $subject, $body, $fromName, $fromEmail){
    	$PHPMailer = &ZFactory::getPHPMailer();
		$body = preg_replace('/\\\\/','', $body);//Strip backslashes
		//设置发邮件类型
		$PHPMailer->IsMail();
		//设置收件人
        $PHPMailer->ClearAddresses();
		$PHPMailer->AddAddress($toEmail, $toName);
		//设置发件人
		$PHPMailer->SetFrom($fromEmail, $fromName);
		//设置邮件标题
		$PHPMailer->Subject = $subject;
		$PHPMailer->WordWrap   = 80; // set word wrap
		//邮件内容
		$PHPMailer->MsgHTML($body);
		
		$result = true;
		
		$ret = $PHPMailer->Send();
		if (!$ret){
			$result = $PHPMailer->ErrorInfo;
		}
		return $result;
    }
    
    
	/**
	 * @desc 404跳转
	 * @access public
	 * @return  void
	 */
	public function redirect404(){
		header("HTTP/1.0 404 Not Found");
		//Nginx不支持
		//header("Status: 404 Not Found");
		
		//加载伪静态处理对象
		$url = '404.php';
		header( 'Location: ' . $url );exit;
	}
    
    
	/**
     * @desc ob_start缓存压缩函数
     * @static
     * @access public
     * @param string $buffer 缓存内容
     * @return string
     */
    public static function compress($buffer){
    	$buffer = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $buffer);
		return $buffer;
    }
    
    
    
    /**
     * @desc 压缩Html内容去掉空白无用的字符
     * @static
     * @access public
     * @param string $string	html内容
     * @return string
     */
    public static function compressHtml($string) {
	    $string = str_replace('\r\n', '', $string); //清除换行符
	    $string = str_replace('\n', '', $string); //清除换行符
	    $string = str_replace('\t', '', $string); //清除制表符
	    $pattern = array (
	        "/> *([^ ]*) *</", //去掉注释标记
	        "/[\s]+/",
	        "/<!--[^!]*-->/",
	        //"/\" /",   // 防止如  \" src 标签合并
	       	"/ \"/",
	        "'/\*[^*]*\*/'"
	    );
	    $replace = array (
	        ">\\1<",
	        " ",
	        "",
			//"\"",
	        "\"",
	        ""
	    );
	    return preg_replace($pattern, $replace, $string);
	}
    
    
}