Import and export php class code for CVS files

PHP class code for importing and exporting CVS files. Through this custom PHP class, the conversion of database data and CVS files can be realized

/**
 *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;

 //Check 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){
 $msg = 'Imported files must not exceed'.$maxsize. 'B file';
 $flag = true;
 }
 }

 //Read file
 if($flag == flase){
 $row = 0;
 $handle = fopen($path,'r' );
 $dataArray = array();
 while($data = fgetcsv($handle,$max_column,",")){
 $num = count($data);
 if($num < $column) {
 $msg = 'The file does not meet the specifications. True: '.$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@zhongsou.com'),
 1=>array('xiaohai2','213456','xiaohai2@zhongsou. com'),
 2=>array('xiaohai3','123456','xiaohai3@zhongsou.com')
 ));

$column = 3;
$csv = new Csv($param_arr, $column );
//$csv->export();
$path = 'C:Documents and SettingsAdministratorLocal SettingsTemptxxx.csv';
$import_arr = $csv->import($path,3);
var_dump($ import_arr);

?>

CVS, php