使用U + 202E保护文件上传文件

Question

how would one detect if a user put the unicode U+202E in their file? I dont want to accept files with that character for security reasons.

Thank you very much.

Answer 1

To remove:

$str = preg_replace("/[\x{202E}]+/u", "", $str);

or just check if something contains U+202E

if(preg_match("/[\x{202E}]+/u", $str)){

if you want to search all U+202A-E use [\x{202A}-\x{202E}]