PHP 导出到 CSV 文件的前两行为空

Question

我在一个数组中有以下数据，并想写入 CSV 文件。一切正常，除了我在 .csv 文件中看到前两个空行

感谢任何帮助...再次感谢！！！！

CSV 文件中的输出如下所示 空 Line1
空 Line2
ip 地址 ip 状态描述 hostmane mac owner 设备备注 数据……

数组数据：

Array (
[0] =>Array ( [ip address] => 1.3.2.1 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => ) 
[1] =>Array ( [ip address] => 1.3.2.2 [ip state] => Reserved [description] => [hostname] => linux [mac] => [owner] => test [device] => Linux Server [note] => Linux123 )
[2] => Array ( [ip address] => 1.3.2.3 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => )
[3] => Array ( [ip address] => 1.3.2.4 [ip state] => Active [description] => [hostname] => [mac] => [owner] => [device] => [note] => )
)  

我用来写入 CSV 文件的 PHP 函数是：

switch("export-to-csv")
{   
    case "export-to-csv" :
        // Submission from
        $filename = $_GET["exformat"] . ".csv";
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Content-type: text/csv");
        header("Content-Disposition: attachment; filename=\"$filename\"");
        header("Expires: 0");
        ExportCSVFile($data);
        //$_GET["exformat"] = '';
        exit();
    default :
        die("Unknown action : ".$_POST["action"]);
        break;
}

function ExportCSVFile($records) {
    // create a file pointer connected to the output stream 
    #print_r ($records); return;
    $fh = fopen( 'php://output', 'w' );
    $heading = false;
    if(!empty($records)) {
        foreach($records as $row) {            
            if(!$heading)  {
              // output the column headings
              fputcsv($fh, array_keys($row));
              $heading = true;
            }
        // loop over the rows, outputting them
         fputcsv($fh, array_values($row));              
      }       

    }
}

Answer 1

请任何文件，如框架的 index.php 或任何其他开头有空行的文件，这可能会导致 csv 中的空行。

Answer 2

请检查您在函数调用之前包含的其他文件以及哪些文件有打印空间等。您可以检查使用记事本在记事本中打开导出的 csv 文件，您可以查看是否有空间或您的 php 代码是否正常工作完美，没有任何问题。我已经用波纹管阵列测试了它的工作正常。

$data = array(
    '0' => array('ip address' => '1.3.2.1', 'ip state' => 'Active'),
    '1' => array('ip address' => '1.3.2.2', 'ip state' => 'Reserved'),
    '2' => array('ip address' => '1.3.2.3', 'ip state' => 'Active'),
    '3' => array('ip address' => '1.3.2.4', 'ip state' => 'Active')
);

switch ("export-to-csv")
{
    case "export-to-csv" :
        $filename = "1.csv";
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header("Content-type: text/csv");
        header("Content-Disposition: attachment; filename=\"$filename\"");
        header("Expires: 0");
        ExportCSVFile($data);
        exit();
    default :
        die("Unknown action : " . $_POST["action"]);
        break;
}

function ExportCSVFile($records)
{
    $fh = fopen('php://output', 'w');
    $heading = false;
    if (!empty($records))
    {
        foreach ($records as $row)
        {
            if (!$heading)
            {
                fputcsv($fh, array_keys($row));
                $heading = true;
            }
            fputcsv($fh, array_values($row));
        }
    }
}