PHP 读取/导出 CSV文件

/**
* 读取CSV文件
* @param string $csv_file csv文件路径
* @param int $lines       读取行数
* @param int $offset      起始行数
* @return array|bool
*/
public function read_csv_lines($csv_file = '', $lines = 0, $offset = 0)
{
if (!$fp = fopen($csv_file, 'r')) {
return false;
}
$i = $j = 0;
while (false !== ($line = fgets($fp))) {
if ($i++ < $offset) {
continue;
}
break;
}
$data = array();
while (($j++ < $lines) && !feof($fp)) {
$data[] = fgetcsv($fp);
}
fclose($fp);
return $data;
}
/**
* 导出CSV文件
* @param array $data        数据
* @param array $header_data 首行数据
* @param string $file_name  文件名称
* @return string
*/
public function export_csv_1($data = [], $header_data = [], $file_name = '')
{
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . $file_name);
if (!empty($header_data)) {
echo iconv('utf-8','gbk//TRANSLIT','"'.implode('","',$header_data).'"'."\n");
}
foreach ($data as $key => $value) {
$output = array();
$output[] = $value['id'];
$output[] = $value['name'];
echo iconv('utf-8','gbk//TRANSLIT','"'.implode('","', $output)."\"\n");
}
}
/**
* 导出CSV文件
* @param array $data        数据
* @param array $header_data 首行数据
* @param string $file_name  文件名称
* @return string
*/
public function export_csv_2($data = [], $header_data = [], $file_name = '')
{
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename='.$file_name);
header('Cache-Control: max-age=0');
$fp = fopen('php://output', 'a');
if (!empty($header_data)) {
foreach ($header_data as $key => $value) {
$header_data[$key] = iconv('utf-8', 'gbk', $value);
}
fputcsv($fp, $header_data);
}
$num = 0;
//每隔$limit行，刷新一下输出buffer，不要太大，也不要太小
$limit = 100000;
//逐行取出数据，不浪费内存
$count = count($data);
if ($count > 0) {
for ($i = 0; $i < $count; $i++) {
$num++;
//刷新一下输出buffer，防止由于数据过多造成问题
if ($limit == $num) {
ob_flush();
flush();
$num = 0;
}
$row = $data[$i];
foreach ($row as $key => $value) {
$row[$key] = iconv('utf-8', 'gbk', $value);
}
fputcsv($fp, $row);
}
}
fclose($fp);
}