php表格--大数据处理

<?php
namespace Think;
class Csv
{
    //导出csv文件
    public function put_csv($list,$title)
    {
        $file_name = "exam".time().".csv";
        header(‘Content-Type: application/vnd.ms-excel‘);
        header(‘Content-Disposition: attachment;filename=‘.$file_name );
        header(‘Cache-Control: max-age=0‘);
        $file = fopen(‘php://output‘,"a");
        $limit = 1000;
        $calc = 0;
        foreach ($title as $v){
            $tit[] = iconv(‘UTF-8‘, ‘GB2312//IGNORE‘,$v);
        }
        fputcsv($file,$tit);
        foreach ($list as $v){
            $calc++;
            if($limit == $calc){
                ob_flush();
                flush();
                $calc = 0;
            }
            foreach($v as $t){
                $tarr[] = iconv(‘UTF-8‘, ‘GB2312//IGNORE‘,$t);
            }
            fputcsv($file,$tarr);
            unset($tarr);
        }
        unset($list);
        fclose($file);
        exit();
    }
   
    // csv导入,此格式每次最多可以处理1000条数据  
    public function input_csv($csv_file) {  
        $result_arr = array ();  
        $i = 0;  
        while($data_line = fgetcsv($csv_file,10000)) {  
            if ($i == 0) {  
                $GLOBALS [‘csv_key_name_arr‘] = $data_line;  
                $i ++;  
                continue;  
            }      
            foreach($GLOBALS[‘csv_key_name_arr‘] as $csv_key_num => $csv_key_name ) {  
                $result_arr[$i][$csv_key_name] = $data_line[$csv_key_num];  
            }  
            $i++;  
        }  
        return $result_arr;  
    }  
}
?>

<?php
namespace app\index\controller;
use think\Controller;
use think\Request;
use think\Db;
use think\Paginator;
use think\Validate;
use think\Csv;  //此处是csv文件实现的关键
class Index extends Controller
{
    public function _initialize()
    {
      header("Content-type:text/html;charset=utf-8");
    }    
    /*
     * CSV试题导出
     */
    public function downQuestions()
    {       
        $condition[‘qu_status‘] = array(‘gt‘,‘-1‘);
        $csv = new Csv();  //实例化后才可以调用之前类文件定义好的方法
        $list = Db::table(‘gw_questions‘)->field(‘qu_name,qu_options,qu_answer,qu_describe,gw_topic.to_name,qu_time,te_name‘)->join(‘gw_topic‘,‘gw_topic.to_id=gw_questions.to_id‘)->join(‘gw_teacher‘,‘gw_teacher.te_id=gw_questions.te_id‘,‘LEFT‘)->where($condition)->select();
        $csv_title = array(‘题干内容‘,‘选项详情‘,‘参考答案‘,‘答案解析‘,‘题型‘,‘录入时间‘,‘录入人‘);
        $csv->put_csv($list,$csv_title);
    }
    
    /*
     * CSV试题导入
     */   
    public function upQuestionsWrite()
    {
        // 获取表单上传文件
        $file = request()->file(‘examfile‘);
        if(empty($file)) {
            $this->error(‘请选择上传文件‘);
        }
        // 移动到框架应用根目录/public/uploads/ 目录下
        $info = $file->move(ROOT_PATH.‘public‘.DS.‘upload‘); 
        //获取文件（日期/文件），$info->getFilename();
        $filename = ROOT_PATH.‘public‘.DS.‘upload/‘.$info->getSaveName();
        $handle = fopen($filename,‘r‘);
        $csv = new Csv();  
        $result = $csv->input_csv($handle); // 解析csv  
        $len_result = count($result);  
        if($len_result == 0){  
            $this->error(‘此文件中没有数据！‘);
        }  
        $data_values = ‘‘;  
        for($i = 1;$i < $len_result+1;$i ++) { // 循环获取各字段值  
            $arr = array_values($result[$i]);  
            $qu_name = iconv(‘gb2312‘,‘utf-8‘,$arr[0] ); // 中文转码  
            $qu_options = iconv(‘gb2312‘,‘utf-8‘,$arr[1]);  
            $qu_answer = $arr[2];  
            $qu_describe = iconv(‘gb2312‘,‘utf-8‘,$arr[3]);
            $to_id = $arr[4]; 
            $te_id = 1; //添加试题的教师           
            $data_values .= "(‘$qu_name‘,‘$qu_options‘,‘$qu_answer‘,‘$qu_describe‘,‘$to_id‘,‘$te_id‘),";  
        }  
        $data_values = substr($data_values,0,- 1 ); // 去掉最后一个逗号  
        fclose($handle); // 关闭指针
        // 批量插入数据表中
        $result = DB::execute("insert into gw_questions (qu_name,qu_options,qu_answer,qu_describe,to_id,te_id) values $data_values" );
        if($result){            
            $this->success(‘文件上传成功，数据已经导入！‘,‘exampaper‘,3);
        }else{
            // 上传失败获取错误信息
            $this->error($file->getError());
        }
    }   
}
?> 

<form action="{:url(‘index/index/upQuestionsWrite‘)}" method="post" class="form form-horizontal" enctype="multipart/form-data" id="addform">    
    <div class="row cl">
    <label class="form-label col-xs-4 col-sm-2">选择试题文件：</label>
    <div class="btn-upload form-group">
        <input type="text" name="uploadfile" id="uploadfile" class="input-text upload-url radius" readonly> <a href="javascript:void();" class="btn btn-primary radius"><i class="Hui-iconfont"></i>浏览文件</a>
        <input type="file" name="examfile" class="input-file" multiple>                
    </div>    
    <a class="btn btn-success btn-submit">导入试题</a>
    </div>    
</form>

<script type="text/javascript">
$(function(){     
    //表单提交时判断是否有文件存在
    $(".btn-submit").click(function(){
        if($("input[name=‘uploadfile‘]").val() == ‘‘){
            alert("请选择CSV文件！");
            return false;
    }else{
        $("#addform").submit();
    }
    });     
});
</script>