What potential issues can arise when passing values with "#" characters using $_GET in PHP scripts?

Passing values with "#" characters using $_GET in PHP scripts can cause problems because the "#" character is used to indicate an anchor in URLs, and it may interfere with the actual value being passed. To solve this issue, you can urlencode the value before passing it in the URL to ensure that special characters like "#" are properly encoded and decoded. 

$value = urlencode("value_with_#_character");
echo '<a href="script.php?param='.$value.'">Link</a>';

Keywords

PHP $_GET URL encoding security vulnerability cross-site scripting

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