PHP exports csv files: specify encoding export and csv file import and export classes

/*
 * PHP code to export MySQL data to CSV
 *
 * Sends the result of a MySQL query as a CSV file for download
 * Easy to convert to UTF-8.
 */

 /*
 * establish database connection
 */

$conn = mysql_connect('localhost', 'login', 'pass') or die(mysql_error());
mysql_select_db('database_name', $conn) or die(mysql_error($conn));
mysql_query("SET NAMES CP1252");
/*
 * execute sql query
 */
$query = sprintf('SELECT field1,field2 FROM table_name');
$result = mysql_query($query, $conn) or die(mysql_error($conn));
/*
 * send response headers to the browser
 * following headers instruct the browser to treat the data as a csv file called export.csv
 */
header('Content-Type: text/csv; charset=cp1252');
header('Content-Disposition: attachment;filename=output.csv');
/*
 * output header row (if atleast one row exists)
 */

$row = mysql_fetch_assoc($result);
if ($row) {
  echocsv(array_keys($row));
}

/*
 * output data rows (if atleast one row exists)
 */ 导出csv文件
while ($row) {
  echocsv($row);
  $row = mysql_fetch_assoc($result);
}

/*
 * echo the input array as csv data maintaining consistency with most CSV implementations
 * - uses double-quotes as enclosure when necessary
 * - uses double double-quotes to escape double-quotes
 * - uses CRLF as a line separator
 */

function echocsv($fields)
{
  $separator = '';
  foreach ($fields as $field) {
    if (preg_match('/\r|\n|,|"/', $field)) {
 $field = '"' . str_replace('"', '""', $field) . '"';
    }
    echo $separator . $field;
    $separator = ',';
  }
  echo "rn";
}
?>

2. PHP import and export csv file classes

php implements the import and export classes of csv files. Code:

/**
 *CSV file processing class
*/
class Csv{
 public $csv_array; //csv array data
 public $csv_str; //csv file data
 public function __construct($param_arr , $column){
 $this->csv_array = $param_arr;
 $this->path = $path;
 $this->column = $column;
 }
 /**
 * Export
 **/
 public function export(){
 if(empty($this->csv_array) || empty($this->column)){
 return false;
 }
 $param_arr = $this->csv_array;
 unset ($this->csv_array);
 $export_str = implode(',',$param_arr['nav'])."n";
 unset($param_arr['nav']);
 //Assemble data
 foreach($param_arr as $k=>$v){
 foreach($v as $k1=>$v1){
 $export_str .= implode(',',$v1)."n";
 }
 }
 //Export $export_str
 header( "Cache-Control: public" );
 header( "Pragma: public" );
 header("Content-type:application/vnd.ms-excel");
 header("Content-Disposition:attachment;filename=txxx.csv");
 header('Content-Type:APPLICATION/OCTET-STREAM');
 ob_start();
 // $file_str= iconv("utf-8 ",'gbk',$export_str);
 ob_end_clean();
 echo $export_str;
 }
 /**
 * Import
 **/
 public function import($path,$column = 3){
 $flag = flase ;
 $code = 0;
 $msg = 'Unprocessed';
 $filesize = 1; //1MB
 $maxsize = $filesize * 1024 * 1024;
 $max_column = 1000;

 //Detect whether the file exists
 if($flag === flase){
 if(!file_exists($path)){
 $msg = 'File does not exist';
 $flag = true;
 }
 }
 //Detect file format
 if ($flag === flase){
 $ext = preg_replace("/.*.([^.]+)/","$1",$path);
 if($ext != 'csv'){
 $msg = 'Only CSV format files can be imported';
 $flag = true;
 }
 }
 //Detect file size
 if($flag === flase){
 if(filesize($path)> $maxsize){
 $msg = 'The imported file must not exceed'.$maxsize.'B file';
 $flag = true;
 }
 }
 //Read the file
 if($flag == flase){
 $row = 0;
 $handle = fopen($path,'r');
 $dataArray = array();
 while($data = fgetcsv($handle,$max_column,",")){
 $ num = count($data);
 if($num < $column){
 $msg = 'The file does not meet the specifications and actually contains: '.$num.' column data';
 $flag = true;
 break;
 }
 if($flag === flase){
 for($i=0;$i<3;$i++){
 if($row == 0){
 break;
 }
 //Build data
 $dataArray[$row][$i] = $data[$i];
 }
 }
 $row++;
 }
 }
 return $dataArray;
 }
}
$param_arr = array(
'nav' =>array('username','password','email'),
array(0=>array('xiaohai1','123456','xiaohai1@jbxue.com'),
 1=> array('xiaohai2','213456','xiaohai2@jbxue.com'),
 2=>array('xiaohai3','123456','xiaohai3@jbxue.com')
));
$column = 3;
$csv = new Csv($param_arr, $column);
//$csv->export();
$path = 'C:Documents and SettingsAdministratorTemptxxx.csv';
$import_arr = $csv-> ;import($path,3);
var_dump($import_arr);
?>