php export CSV abstract class

黄舟
Release: 2023-03-05 19:28:01
Original
1049 people have browsed it

php Export CSV abstract class, calculate the total batch according to the total number of records and the number of records in each batch, and export in a loop. Avoid out of memory issues.


##ExportCSV.class.php


<?php
/** php Export CSV abstract class,根据总记录数与每批次记录数,计算总批次,循环导出。
*   Date:   2014-05-16
*   Author: fdipzone
*   Ver:    1.0
*
*   Func:
*   public  setPageSize      设置每批次导出的记录条数
*   public  setExportName    设置导出的文件名
*   public  setSeparator     设置分隔符
*   public  setDelimiter     设置定界符
*   public  export           执行导出
*   private getPageCount     计算导出总批次
*   private setHeader        设置导出文件header
*   private formatCSV        将数据格式化为csv格式
*   private escape           转义字符串
*   abstract getExportTotal  获取总记录条数,抽象方法,需继承类实现
*   abstract getExportFields 获取导出的列名,抽象方法,需继承类实现
*   abstract getExportData   获取每页记录,抽象方法,需继承类实现
*/

abstract class ExportCSV{ // class start

    // 定义子类必须要实现的方法
    
    /** 获取总记录条数
    * @return int
    */
    abstract protected function getExportTotal();

    /** 获取导出的列名
    * @return Array
    */
    abstract protected function getExportFields();

    /** 获取每批次数据
    * @param  int $offset 偏移量
    * @param  int $limit  获取的记录条数
    * @return Array
    */
    abstract protected function getExportData($offset, $limit);


    // 定义类属性
    protected $total = 0;                 // 总记录数
    protected $pagesize = 500;            // 每批次导出的记录数
    protected $exportName = &#39;export.csv&#39;; // 导出的文件名
    protected $separator = &#39;,&#39;;           // 设置分隔符
    protected $delimiter = &#39;"&#39;;           // 设置定界符


    /** 设置每次导出的记录条数
    * @param int $pagesize 每次导出的记录条数
    */
    public function setPageSize($pagesize=0){
        if(is_numeric($pagesize) && $pagesize>0){
            $this->pagesize = $pagesize;
        }
    }


    /** 设置导出的文件名
    * @param String $filename 导出的文件名
    */
    public function setExportName($filename){
        if($filename!=&#39;&#39;){
            $this->exportName = $filename;
        }
    }


    /** 设置分隔符
    * @param String $separator 分隔符
    */
    public function setSeparator($separator){
        if($separator!=&#39;&#39;){
            $this->separator = $separator;
        }
    }


    /** 设置定界符
    * @param String $delimiter 定界符
    */
    public function setDelimiter($delimiter){
        if($delimiter!=&#39;&#39;){
            $this->delimiter = $delimiter;
        }
    }


    /** 导出csv */
    public function export(){

        // 获取总记录数
        $this->total = $this->getExportTotal();

        // 没有记录
        if(!$this->total){
            return false;
        }

        // 计算导出总批次
        $pagecount = $this->getPageCount();

        // 获取导出的列名
        $fields = $this->getExportFields();

        // 设置导出文件header
        $this->setHeader();

        // 循环导出
        for($i=0; $i<$pagecount; $i++){

            $exportData = &#39;&#39;;

            if($i==0){ // 第一条记录前先导出列名
                $exportData .= $this->formatCSV($fields);
            }

            // 设置偏移值
            $offset = $i*$this->pagesize;

            // 获取每页数据
            $data = $this->getExportData($offset, $this->pagesize);

            // 将每页数据转换为csv格式
            if($data){
                foreach($data as $row){
                    $exportData .= $this->formatCSV($row);
                }
            }

            // 导出数据
            echo $exportData;
        }

    }


    /** 计算总批次 */
    private function getPageCount(){
        $pagecount = (int)(($this->total-1)/$this->pagesize)+1;
        return $pagecount;
    }


    /** 设置导出文件header */
    private function setHeader(){
        header(&#39;content-type:application/x-msexcel&#39;);

        $ua = $_SERVER[&#39;HTTP_USER_AGENT&#39;];

        if(preg_match("/MSIE/", $ua)){
            header(&#39;content-disposition:attachment; filename="&#39;.rawurlencode($this->exportName).&#39;"&#39;);
        }elseif(preg_match("/Firefox/", $ua)){
            header("content-disposition:attachment; filename*=\"utf8&#39;&#39;".$this->exportName.&#39;"&#39;);
        }else{
            header(&#39;content-disposition:attachment; filename="&#39;.$this->exportName.&#39;"&#39;);
        }

        ob_end_flush();
        ob_implicit_flush(true);
    }


    /** 格式化为csv格式数据
    * @param Array $data 要转换为csv格式的数组
    */
    private function formatCSV($data=array()){
        // 对数组每个元素进行转义
        $data = array_map(array($this,&#39;escape&#39;), $data);
        return $this->delimiter.implode($this->delimiter.$this->separator.$this->delimiter, $data).$this->delimiter."\r\n";
    }


    /** 转义字符串
    * @param  String $str
    * @return String
    */
    private function escape($str){
        return str_replace($this->delimiter, $this->delimiter.$this->delimiter, $str);
    }

} // class end

?>
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demo


##

<?php

// ExportCSV abstract class
require "ExportCSV.class.php";

// 定义继承类
class myexport extends ExportCSV{

    // 要导出的数据,实际情况会从db读取
    protected $data = array(
        array(&#39;1&#39;,&#39;傲雪星枫"&#39;,&#39;男&#39;),
        array(&#39;2&#39;,&#39;傲雪星枫","&#39;,&#39;男&#39;),
        array(&#39;3&#39;,&#39;傲雪星枫","&#39;,&#39;男&#39;),
        array(&#39;4&#39;,"傲雪星枫\"\"\r\n换行",&#39;男&#39;),
        array(&#39;5&#39;,&#39;傲雪星枫,,&#39;,&#39;男&#39;),
        array(&#39;6&#39;,&#39;傲雪星枫"&#39;,&#39;男&#39;),
        array(&#39;7&#39;,&#39;傲雪星枫&#39;,&#39;男&#39;),
        array(&#39;8&#39;,&#39;傲雪星枫&#39;,&#39;男&#39;),
        array(&#39;9&#39;,&#39;傲雪星枫&#39;,&#39;男&#39;),
        array(&#39;10&#39;,&#39;傲雪星枫&#39;,&#39;男&#39;)
    );

    /* 返回总导出记录数
    * @return int
    */
    protected function getExportTotal(){
        return count($this->data);
    }

    /** 返回导出的列名
    * @return Array
    */
    protected function getExportFields(){
        $title = array(&#39;id&#39;,&#39;name&#39;,&#39;gender&#39;);
        return $title;
    }

    /* 返回每批次的记录
    * @param  int $offset 偏移量
    * @param  int $limit  获取的记录条数
    * @return Array
    */
    protected function getExportData($offset, $limit){
        return array_slice($this->data, $offset, $limit);
    }

}

// 导出
$obj = new myexport();
$obj->setPageSize(1);
$obj->setExportName(&#39;myexport.csv&#39;);
$obj->setSeparator(&#39;,&#39;);
$obj->setDelimiter(&#39;"&#39;);
$obj->export();

?>
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