Setting "ftp > port" option to empty string in Configuration
Manager will output invalid conf/local.php, that makes DokuWiki
An empty string should be output in the following manner:
$conf['ftp']['port'] = '';
But currently the output is:
$conf['ftp']['port'] = ;
This results in a fatal syntax error.
This bug is caused by an inappropriate handling of "numericopt"
class in the Configuration Manager. Attached file is my patch
for this bug.