PHP read/export CSV file

There are often import/export requirements at work. The following are commonly used methods.
To read a CSV file, you can read it in pages, just set the number of lines to read and the number of starting lines.
Export CSV files, implemented in two ways.

/**<br> * Read CSV file<br> * @param string $csv_file csv file path<br> * @param int $lines Read the number of lines<br> * @param int $offset Starting line number<br> * @return array|bool<br> ​*/<br> public function read_csv_lines($csv_file = '', $lines = 0, $offset = 0)<br> {<br>     if (!$fp = fopen($csv_file, 'r')) {<br>         return false;<br>     }<br>     $i = $j = 0;<br>     while (false !== ($line = fgets($fp))) {<br>         if ($i++              continue;<br>         }<br>         break;<br>     }<br>     $data = array();<br>     while (($j++          $data[] = fgetcsv($fp);<br>     }<br>     fclose($fp);<br>     return $data;<br> }<br> <br> <br> /**<br> * Export CSV file<br> * @param array $data Data<br> * @param array $header_data first row of data<br> * @param string $file_name File name<br> * @return string<br> ​*/<br> public function export_csv_1($data = [], $header_data = [], $file_name = '')<br> {<br>     header('Content-Type: application/octet-stream');<br>     header('Content-Disposition: attachment; filename=' . $file_name);<br>     if (!empty($header_data)) {<br>         echo iconv('utf-8','gbk//TRANSLIT','"'.implode('","',$header_data).'"'."n");<br>     }<br>     foreach ($data as $key => $value) {<br>         $output = array();<br>         $output[] = $value['id'];<br>         $output[] = $value['name'];<br>         echo iconv('utf-8','gbk//TRANSLIT','"'.implode('","', $output).""n");<br>     }<br> }<br> <br> /**<br> * Export CSV file<br> * @param array $data Data<br> * @param array $header_data first row of data<br> * @param string $file_name File name<br> * @return string<br> ​*/<br> public function export_csv_2($data = [], $header_data = [], $file_name = '')<br> {<br>     header('Content-Type: application/vnd.ms-excel');<br>     header('Content-Disposition: attachment;filename='.$file_name);<br>     header('Cache-Control: max-age=0');<br>     $fp = fopen('php://output', 'a');<br>     if (!empty($header_data)) {<br>         foreach ($header_data as $key => $value) {<br>             $header_data[$key] = iconv('utf-8', 'gbk', $value);<br>         }<br>         fputcsv($fp, $header_data);<br>     }<br>     $num = 0;<br>     //每隔$limit行，刷新一下输出buffer，不要太大，也不要太小<br>$limit = 100000;<br> //Get data line by line without wasting memory<br> $count = count($data);<br> If ($count > 0) {<br> for ($i = 0; $i               $num++;<br> ​​​​​​ //Refresh the output buffer to prevent problems caused by too much data<br>                if ($limit == $num) {<br>                                                              ob_flush();<br> flush();<br>                   $num = 0;<br>             }<br>               $row = $data[$i];<br> foreach ($row as $key => $value) {<br>                $row[$key] = iconv('utf-8', 'gbk', $value);<br>             }<br>                          fputcsv($fp, $row);<br>         }<br> }<br> ​​fclose($fp);<br> }For more [dry information sharing], please follow the PHP engineer subscription account.