Failure to correctly implement ftp_nlist in php

I use the ftp_nlist command to check if the folder doesn't exist, then create it with the ftp_mkdir command.

But the problem that is there and has recently been created for me is that sometimes ftp_nlist returns a false value, which causes the ftp_mkdir command to encounter an error.

And what is more surprising is that in the next attempt, sometimes the ftp_nlist command that I try returns the existing array, which is correct and expected.

This problem happened to me recently and it was not a problem before.

Please guide me if anyone knows. thanks

if(!ftp_nlist($ftp_conn , 'public_html/images')) {
ftp_mkdir($ftp_conn, 'public_html/images');
}

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