/**
 * 导出数据到CSV文件
 * @param array $data  数据
 * @param array $title_arr 标题
 * @param string $file_name CSV文件名
 */
function export_csv(&$data, $title_arr, $file_name = '') {
    ini_set("max_execution_time", "3600");

    $csv_data = '';

    /** 标题 */
    $nums = count($title_arr);
    for ($i = 0; $i < $nums - 1; ++$i) {
        $csv_data .= '"' . $title_arr[$i] . '",';
    }

    if ($nums > 0) {
     $csv_data .= '"' . $title_arr[$nums - 1] . "\"\r\n";
    }

    foreach ($data as $k => $row) {
        for ($i = 0; $i < $nums - 1; ++$i) {
            $row[$i] = str_replace("\"", "\"\"", $row[$i]);
            $csv_data .= '"' . $row[$i] . '",';
        }
        $csv_data .= '"' . $row[$nums - 1] . "\"\r\n";
        unset($data[$k]);
    }

    $csv_data = mb_convert_encoding($csv_data, "cp936", "UTF-8");

    $file_name = empty($file_name) ? date('Y-m-d-H-i-s', time()) : $file_name;

    if (strpos($_SERVER['HTTP_USER_AGENT'], "MSIE")) { // 解决IE浏览器输出中文名乱码的bug
     $file_name = urlencode($file_name);
     $file_name = str_replace('+', '%20', $file_name);
    }

    $file_name = $file_name . '.csv';
    header("Content-type:text/csv;");
    header("Content-Disposition:attachment;filename=" . $file_name);
    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
    header('Expires:0');
    header('Pragma:public');
    echo $csv_data;
}

function export_csv($data, $title_arr, $file_name = '') {

    $csv_data = '';

    /** 标题 */
    $nums = count($title_arr);
    for ($i = 0; $i < $nums - 1; ++$i) {
        $csv_data .= '"' . $title_arr[$i] . '",';
    }

    if ($nums > 0) {
    $csv_data .= '"' . $title_arr[$nums - 1] . "\"\r\n";
    }

    foreach ($data as $k => $row) {
        for ($i = 0; $i < $nums - 1; ++$i) {
            $row[$i] = str_replace("\"", "\"\"", $row[$i]);
            $csv_data .= '"' . $row[$i] . '",';
        }
        $csv_data .= '"' . $row[$nums - 1] . "\"\r\n";
        unset($data[$k]);
    }

    $file_name = empty($file_name) ? date('Y-m-d-H-i-s', time()) : $file_name;
    file_put_contents($file_name, $csv_data) ;
}

$file_name="/var/www/tmp/test.csv" ;

$header = array(
                    '0' => '参数ID',
                    '1' => '参数名称',
                    '2' => '统计次数',
                    '3' => '统计次数百分比',
                    '4' => '唯一用户数',
                    '5' => '唯一用户数百分比',
                    '6' => '人均次数'
            );
            $csvList = array(array("111", "title", "12", "100%", "23", "50%", "4")) ;
            export_csv($csvList, $header, $file_name) ;