When ModSecurity is enabled on apache server then "scandir" is forbidden word. When changing numbering model then you will find following error in apache log: 
ModSecurity: Access denied with code 403 (phase 2). Pattern match "(?i)(?:\\\\b(?:f(?:tp_(?:nb_)?f?(?:ge|pu)t|get(?:s?s|c)|s(?:ession_start|candir)
I have changed "scandir" to "scan_dir".

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