PHP FTP Get directory content is empty

Using PHP's FTP function to get the contents of the directory, Ftp_nlist () and Ftp_rawlist () return are empty.

Looked up a circle of information can not find the answer, and then wrote in Python, the same operation will be able to get the contents of the directory.

The capture packet found that Python automatically changed to passive mode before getting the contents of the directory, and Ftp_rawlist () manually ftp_pasv ($con, TRUE) before PHP was able to get the content.

Summary: Perhaps the FTP protocol does not understand, resulting in such problems, write down here, to prevent you from stepping on the pit ^_^

PHP FTP Get directory content is empty