{3} [0-9 ]{2} [0-9 ][0-9]:[0-9][0-9]—修改时间（您可以对这个模式进行一些简化，因为所有的文件都在6月份进行的修改，所以您可以确切地指定月份的名称。）
[0-9]:[0-9][0-9] -- modification time (You could simplify this a bit, since all of the files were all modified in June, and you could make it more exact by specifying the month names.)
{3}[0 - 9]{2}[0 - 9][0 - 9]：[0 - 9][0 - 9]—修改时间(您可以对这个模式进行一些简化，因为所有的文件都在6月份进行的修改，所以您可以确切地指定月份的名称。)
[0-9] [0-9] : [0-9] [0-9] — modification time (you could simplify this a bit, since all of the files were all modified in June, and you could make it more exact by specifying the month names.)
函数的作用是：返回指定文件的最后修改时间。
The ftp_mdtm() function returns when the specified file was last modified.
返回项的修改时间，如果未指定，返回-1。
Returns the modification time of the entry, or -1 if not specified.
如果未指定项的压缩方法，使用默认的压缩方法。如果项没有设置修改时间，则使用当前时间。
The default compression method will be used if no compression method was specified for the entry, and the current time will be used if the entry has no set modification time.
如果未指定项的压缩方法，使用默认的压缩方法。如果项没有设置修改时间，则使用当前时间。
The default compression method will be used if no compression method was specified for the entry, and the current time will be used if the entry has no set modification time.
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