PHP写的从数据库导入到EXCEL

原理： 就是原理很分页原理一样! 选取一定数量的数据然后变成数组，接着直接写入文件。接下来继续选取后面没选定数据在变成数组，接着在写入文件！这个解决了内存溢出。但是多CPU还是有个考验！ 由于本人刚刚学PHP（PHP培训 php教程 ）不久，功力不深厚！只能写出这样的东西！ 

源码！ 
Excel（Excel培训 ）类 
PHP code
class Excel{

    var $header = "<?xml version="1.0" encoding="utf-8"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:x="urn:schemas-microsoft-com:office:excel"
 xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet"
 xmlns:html="http://www.w3.org/TR/REC-html40">";
    var $footer = "</Workbook>";
    var $lines = array ();
    var $worksheet_title = "Table1";
    function addRow ($array) {
        $cells = "";
        foreach ($array as $k => $v):
            if(is_numeric($v)) {
                if(substr($v, 0, 1) == 0) {
                    $cells .= "<Cell><Data ss:Type="String">" . $v . "</Data></Cell>n";
                } else {
                    $cells .= "<Cell><Data ss:Type="Number">" . $v . "</Data></Cell>n";
                }
            } else {
                $cells .= "<Cell><Data ss:Type="String">" . $v . "</Data></Cell>n";
            }
        endforeach;
        $this->lines[] = "<Row>n" . $cells . "</Row>n";
        unset($arry);
    }

    function setWorksheetTitle ($title) {

        $title = preg_replace ("/[\|:|/|?|*|[|]]/", "", $title);

        $title = substr ($title, 0, 31);

        $this->worksheet_title = $title;

    }

    function generateXML ($filename) {

        // deliver header (as recommended in PHP manual)
        header("Content-Type: application/vnd.ms-excel; charset=utf-8");
        header("Content-Disposition: inline; filename="" . $filename . ".xls"");

        // print out document to the browser
        // need to use stripslashes for the damn ">"
        echo stripslashes ($this->header);
        echo "n<Worksheet ss:Name="" . $this->worksheet_title . "">n<Table>n";
        echo "<Column ss:Index="1" ss:AutoFitWidth="0" ss:Width="110"/>n";
        echo implode ("n", $this->lines);
        echo "</Table>n</Worksheet>n";
        echo $this->footer;
        exit;

    }

    function write ($filename) // 重点
    {

        $content= stripslashes ($this->header);
        $content.= "n<Worksheet ss:Name="" . $this->worksheet_title . "">n<Table>n";
        $content.= "<Column ss:Index="1" ss:AutoFitWidth="0" ss:Width="110"/>n";
        $content.= implode ("n", $this->lines);
        $content.= "</Table>n</Worksheet>n";
        $content.= $this->footer;//EXCEL文件
    //error_log($content, 3,$filename);
        if (!file_exists($filename))//判断有没有文件
    {
        fopen($filename,‘a‘);
    }
    $fp = fopen($filename,‘a‘);
    fwrite($fp, $content);//写入文件
    fclose($fp);
    unset($this->lines);//清空内存中的数据
    }

}

页面 
PHP code
include_once"./include/class.excel.PHP";//调用EXCEL类
require_once ‘./include/class.zipfile.PHP‘;//调用大包类 
$xls = new Excel;//实例化
$w=explode("limit",$where_str);//把WHERE
$p=6000; //分页原理
$a=$ip_list_count/$p;//分页原理
if($ip_list_count%$p==0)//分页原理

else//分页原理

for($i=0;$i<=$a;$i++)//循环写出
{
$s=6000*$i;
$ip=$_SG[‘db‘]->fetch_all("select * from main_info".$w[0]." limit ".$s.",".$p);//调用自己写的数据库（数据库培训 数据库认证 ）方法，写出数组
$xls->addArray ( $ip );//调用EXCEL 类中addArray 方法
xml1=$xls->write ("./".$i.".xls");//调用EXCEL 类中write 方法
unset($ip);
unset($xml1);
sleep(1);
}