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Is this line in the index.php file necessary?

 
Author tom322
Active Member		 #1 · Posted: 28 Jan 2026 21:19
In the index.php file, there are these 3 lines of code:

$queryStr=preg_replace("@[^0-9a-zA-Z./#_&=%-]@", '', $queryStr);
$queryStrDisp=str_replace('&', '&', $queryStr);
$queryStr=str_replace('&', '&', $queryStr);// is this one needed?
My question is — is the 3rd line necessary? It seems it doesn't do anything once the first two lines of code are executed (the first line seems to already take care of the ampersand, or I'm wrong)..

Author Paul
Lead Lead Developer		 #2 · Posted: Today 18:18
All these lines are necessary.

The first line removes everything except what is defined in square brackets. It doesn't handle the ampersand. It just secures up this query.

The third line converts the HTML entity of the ampersand which could come from a valid HTML source. Later it could be used in the header page redirection, where no entities are allowed.

Author tom322
Active Member		 #3 · Posted: Today 18:53
Thanks for the explanation, it makes sense now.

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 Is this line in the index.php file necessary?
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