while循环不保存数组值

Question

为什么我的while循环不输出$st['status']的值？

正在成功下载这两个文件。

json_encode($st)不输出任何内容。

while (true) {
    clearstatcache();

    # Get filesize
    $fileSize = ftp_size($conn_id, $txt_filename);

    # Check if txt (status) file exist
    # Filesize will return -1 if no file exist
    if($fileSize == -1) {

        $st['status'] = 'no file';

        # no file
        return true; // continue loop until file exist

    }else{

        # File exist
        # Move remote files (xml and txt) to local folder

        # Download both txt and xml files                           
        if(
            ftp_get($conn_id, $localstatusfolder.'/'.$txt_filename, $txt_filename, FTP_BINARY) &&
            ftp_get($conn_id, $localstatusfolder.'/'.$xml_filename, $xml_filename, FTP_BINARY)
        ) {

            # Files downloaded to local folder
            $st['status'] = 'ok';

            ftp_close($conn_id);

            return false;

        }else{

            # Fejl, ftp_get
            $st['status'] = 'FTP003';

            ftp_close($conn_id);

            return false;
        }
    }
}

echo json_encode($st);

Answer 1

这些行中有错误，

ftp_get($conn_id, $localstatusfolder.'/'.$txt_filename, $txt_filename, FTP_BINARY) &&
ftp_get($conn_id, $localstatusfolder.'/'.$xml_filename, $xml_filename, FTP_BINARY)

尝试删除这些行，然后检查并删除代码中的return false，这意味着代码不会在此后运行。使用适用于此情况的break。