PHP implements the import and export functions of CSV format data-PHP Tutorial-php.cn

PHP implements the import and export functions of CSV format data

墨辰丷

Release： 2023-03-30 10:08:01

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This article mainly introduces how PHP implements the import and export functions of CSV format data. Interested friends can refer to it. I hope it will be helpful to everyone.

We first prepare the mysql data table. Assume that the project has a table student that records student information, and has id, name, sex, age to record the student's name, gender, age and other information respectively.

CREATE TABLE `student` ( 
 `id` int(11) NOT NULL auto_increment, 
 `name` varchar(50) NOT NULL, 
 `sex` varchar(10) NOT NULL, 
 `age` smallint(3) NOT NULL default &#39;0&#39;, 
 PRIMARY KEY (`id`) 
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

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We also need an html interactive page to place the import form and export button.

<form id="addform" action="do.php?action=import" method="post" enctype="multipart/form-data"> 
 <p>请选择要导入的CSV文件：<br/><input type="file" name="file"> <input type="submit" 
 class="btn" value="导入CSV"> 
 <input type="button" class="btn" value="导出CSV" onclick="window.location.href=&#39;do.php? 
 action=export&#39;"></p> 
</form>

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After selecting the local csv file, click Import and submit it to do.php?action=import for processing, and click the Export button to request the address do.php?action=export for data export processing.

1. Import CSV
do.php needs to process the import and export processes separately according to the parameters obtained. The PHP structure is as follows:

include_once ("connect.php"); //连接数据库 
$action = $_GET[&#39;action&#39;]; 
if ($action == &#39;import&#39;) //导入CSV 
{ 
 //导入处理 
}elseif($action==&#39;export&#39;) //导出CSV 
{ 
 //导出处理 
}

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Import CSV processing Process: Verify the legality of the csv file (ignored in this article) ->Open the fields in the csv file that are read and parsed ->Loop to obtain the values of each field ->Add to the data table in batches->Complete.

if ($action == &#39;import&#39;) { //导入CSV 
 $filename = $_FILES[&#39;file&#39;][&#39;tmp_name&#39;]; 
 if(emptyempty ($filename)) 
 { 
  echo &#39;请选择要导入的CSV文件！&#39;; 
  exit; 
 } 
 $handle = fopen($filename, &#39;r&#39;); 
 $result = input_csv($handle); //解析csv 
 $len_result = count($result); 
 if($len_result==0) 
 { 
  echo &#39;没有任何数据！&#39;; 
  exit; 
 } 
 for($i = 1; $i < $len_result; $i++) //循环获取各字段值 
 { 
  $name = iconv(&#39;gb2312&#39;, &#39;utf-8&#39;, $result[$i][0]); //中文转码 
  $sex = iconv(&#39;gb2312&#39;, &#39;utf-8&#39;, $result[$i][1]); 
  $age = $result[$i][2]; 
  $data_values .= "(&#39;$name&#39;,&#39;$sex&#39;,&#39;$age&#39;),"; 
 } 
 $data_values = substr($data_values,0,-1); //去掉最后一个逗号 
 fclose($handle); //关闭指针 
 $query = mysql_query("insert into student (name,sex,age) values $data_values"); //批量插入数据表中 
 if($query) 
 { 
  echo &#39;导入成功！&#39;; 
 }else{ 
  echo &#39;导入失败！&#39;; 
 } 
}

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Note that PHP’s own fgetcsv function can easily handle csv. Use this function to read a line from the file pointer and parse the CSV field. The function below parses the csv file fields and returns them as an array.

function input_csv($handle) 
{ 
 $out = array (); 
 $n = 0; 
 while ($data = fgetcsv($handle, 10000)) 
 { 
  $num = count($data); 
  for ($i = 0; $i < $num; $i++) 
  { 
   $out[$n][$i] = $data[$i]; 
  } 
  $n++; 
 } 
 return $out; 
}

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In addition, when importing into the database, we use batch insertion instead of inserting one by one, so when constructing the SQL statement, we need to do a little processing, see the code.

2. Export CSV
We know that csv file is a plain text file composed of comma delimiters. You can open it with excel, and the effect is the same as xls table.
Export CSV processing process: read student information table->loop records to build comma-separated field information->set header information->export file (download) to local

... 
}elseif ($action==&#39;export&#39;) //导出CSV 
{ 
 $result = mysql_query("select * from student order by id asc"); 
 $str = "姓名,性别,年龄\n"; 
 $str = iconv(&#39;utf-8&#39;,&#39;gb2312&#39;,$str); 
 while($row=mysql_fetch_array($result)) 
 { 
  $name = iconv(&#39;utf-8&#39;,&#39;gb2312&#39;,$row[&#39;name&#39;]); //中文转码 
  $sex = iconv(&#39;utf-8&#39;,&#39;gb2312&#39;,$row[&#39;sex&#39;]); 
  $str .= $name.",".$sex.",".$row[&#39;age&#39;]."\n"; //用引文逗号分开 
 } 
 $filename = date(&#39;Ymd&#39;).&#39;.csv&#39;; //设置文件名 
 export_csv($filename,$str); //导出 
}

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To convert the data Export to local and download, you need to modify the header information, the code is as follows:

function export_csv($filename,$data) 
{ 
 header("Content-type:text/csv"); 
 header("Content-Disposition:attachment;filename=".$filename); 
 header(&#39;Cache-Control:must-revalidate,post-check=0,pre-check=0&#39;); 
 header(&#39;Expires:0&#39;); 
 header(&#39;Pragma:public&#39;); 
 echo $data; 
}

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Summary: The above is the entire content of this article, I hope it will be helpful to everyone's learning.

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