haoshengxin/common/library/HongbaoCommon.php

<?php 
/**
* 发红包的公共类
* 提供一些公共方法 
**/
namespace common\library;
class HongbaoCommon{
	
	public function __construct(){}

	//生成随机字符串,长度最长不超过32位
	public function createNoncestr( $length = 32 ){
		$varchars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
		$str = "";
		for($i=0;$i < $length;$i++){
			$str .= $varchars{(mt_rand(0,strlen($varchars)-1))};
		}
		return $str;
	}
	//xml转换为数组
	public function xmlToarray($xml){
		$array_data = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
		return $array_data;
	}
	//数组转换为xml
	function arrayToXml($arr)
    {

       $xml = '<xml>';
        foreach ($arr as $key => $val) {
            if (is_numeric($val)) {
                $xml .= "<$key>$val</$key>";
            } else {
                $xml .= "<$key><![CDATA[$val]]></$key>";
            }
        }
        $xml .= '</xml>';
        return $xml;
    }
	//过滤字符
	public function trimString($value){
		$ret = null;
		if (null != $value) {
			$ret = $value;
			if (strlen($ret) == 0) {
				$ret = null;
			}
		}
		return $ret;
	}
}