//抓取中国银行汇率表数据
    //Author : hsg4ok@yahoo.com.cn
    //V 1.0
    
    // string file_source 要抓取的内容页
    // string file_target 本机生成的文件
    function getRate($file_source,$file_target) {
        if($file_source == ''){
            return false;
        }

$whandle = fopen($file_target,'w+');
        if(!$whandle){
            echo 'Error,The file can not open.';
            //return false;
            exit;
        }

$times = date('Y-m-d');

$content = file_get_contents($file_source);
        if($content){
            //用正则对抓取的内容进行处理
            $begin = strpos($content,'<table width="560" id="documentContainer"');
            $end = strpos($content,'<table width="560" border="0" cellpadding="5" cellspacing="0" align="center">') - 28;
            $content = trim(substr($content,$begin,($end - $begin)));
            $content = preg_replace("/<([a-z]+)/s[^>]+>/i","<$1>",$content);
            $content = preg_replace("/<td>(/d+)-(/d+)-(/d+)(&nbsp;)(/s+)(/d+):(/d+):(/d+)<//td>/i",'',$content);    //删除日期行
            $content = preg_replace("/>/s+</","><",$content);                //清除所有空白
            $content = str_replace("<table>","<table id='xRate'><caption>Date: ".date('Y-m-d',time())."</caption><tr><th>Currency Name</th><th>Buying Rate</th><th>Cash Buying Rate</th><th>Selling Rate</th><th>Middle Rate</th></tr>",$content);        //添加表标注
        }
        
        //写到目标文件
        if(fwrite($whandle,$content) === false){
            echo "Error,The file can not write.";
            exit;
        }

//关闭文件
        fclose($whandle);
        echo "The File created!";
    }

//调用
    $url = 'http://www.boc.cn/sourcedb/whpj/enindex.html';    //目标地址
    $targetPath = 'D://uploadfile//'.date('Ymd',time()).'.htm';
    getRate($url,$targetPath);