Remove Special Character from String in PHP for mutli languages?

I am using localization and want to change in Arabic special characters here is my code,

 function helper_get_unique_slug($slug)
    {
        if (!empty($slug)) {
             
            $slug = str_replace(" ", "_", $slug);
            $slug=preg_replace('/[^A-Za-z0-9\-]/', '', $slug);
    ````}
    }

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