Php Allow only numeric data and comma, remove duplicate comma?

Duplicate comma including heading and trailing commas you can remove with $string = trim(preg_replace('#,{2,}#', ',', $string), ',') .

PHP offers a filter function for that purpose.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.