Description:
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The manual states for ftp_close():
void ftp_close ( resource $ftp_stream )

And for ftp_quit:
int ftp_quit ( int $ftp_stream )

Anyway, both var_dump(ftp_close($conn_id)) and var_dump(ftp_quit($conn_id)) display bool(true).

In comp.lang.php I got told ftp_quit() was an alias of fpt_close(). If this is the case it would be helpful to find this information in the manual; if not, it would be helpful to find some short info about the differences.